Nodejs HTTP call error: socket hang up

[ERROR: Socket Hang up] code: ‘ECONNRESET’}

Analysis reason: For some reason, the HTTP target address establishment socket connection error

Error resolution: After
Compared with the search, I found that there was a use of the middleware “body-parser” in the NodeJS project here, so there is no problem to remove it

There are other reasons that I haven’t come across here, but I won’t go into them,

Record a front end error net:: err_ HTTP2_ PROTOCOL_ ERROR 200

A browser visiting a front-end resource sends an error net::ERR_HTTP2_PROTOCOL_ERROR 200, or an Intranet request sends an error net::ERR_SPDY_PROTOCOL_ERROR 200, and accesses the resource path directly to receive the resource, but the original page is unavailable.
According to some data, it is said to restart ngxin. It is said that the location of Nginx is configured with proxy_max_temp_file_size 0. The second scheme takes effect after two schemes are tried once.

Error 1406: could not write value installpath to key

 
http://hi.baidu.com/tianxingacer/blog/item/7b2ec88893e59da30e2444cd.html
Before, a VMware was installed on the computer. Later, the system was reinstalled and VMware could not be used. Fortunately, the file of LINUX was imported
It works. Today, install VMware into the same directory of the old files, and report when it is almost finished:
Error 1406: could not write value installpath to key/soft ware/vmware, inc/vmwareconverter hosted verify that you have sufficient access to that key or contalt your support personnel “this Error.
I received it online, and the netizen said it was reasonable that the old VMware registry value was not deleted last time. I did not delete it at all, but directly overwrote it.
The reason may be that the old VMware registry key was not deleted clean before installation, so the current installation cannot write the registry file of registry Software/VMware. The solution is simple: find HKEY_LOCAL_MACHINE–> Software-> VMware, Inc., delete the whole thing, close the registry, and re-run the VMware installation file. Then the problem can be solved.
If the same problem cannot be installed after the above operation, the stupid (and most effective) method is to find the registry, delete all the key values related to VMware, repeat Ctrl+F to find “VMware” and then delete. In order to avoid misoperation, it is recommended to backup the registry in advance.
 
PS. After deleting this key, retry can be installed normally.

How to solve the problem of error 15: file not found when Linux starts

Today, the Linux machine starts and the system prompts:

Root (hd0, 0)
Filesystem type is ext2fs, partition type 0x83
Kernel /bzImage_1360×768 RO root=LABEL=/ video…
Error 15: File not found
Press any key to continue…

The reason may be that the system boot configuration was corrupted, causing the boot kernel image to be unable to be found
Solutions:
1. Press any key to return to the boot menu, such as grub menu.
2. Press ‘C’ in the menu interface to enter the GRUB command line interface.
3. Grub> Root (hd0, 0)
4. Grub> Kernel (HD0,0)/vmlinuz-2.6.18-371.el5 (Press TAB during input to get prompt)
5. grub> The initrd (hd0, 0)/initrd – 2.6.18-371. El5. Img
6. grub> boot

The above (HD0,0)vmlinuz-2.6.18-371.el5 InitRd-2.6.18-371. el5.IMg shall be modified according to the actual situation of the machine. You can use TAB for completion selection.

Reference: http://blog.csdn.net/guanzhongs/article/details/2511740
I cannot boot/ in this document directory. Removing boot as I wrote will solve the problem.
                   

Using selenium server- standalone.jar Console error: unknown error: cannot get automation extension solution

unknown error: cannot get automation extension
Unknown error: unable to get automatic extension
The reason is that the version you downloaded from ChromeDriver is different from the version you browned from Chrome.
Solution, into this website: http://npm.taobao.org/mirrors/chromedriver
First take a look at your Version of Chrome. Click on the three dots in the top right corner. Then click on Help
Go to the following page

 
Then go to the site and find the version that corresponds to your browser

Click the corresponding version to download. Download, unzip, and copy the driver to the url you defined. That’s where the driver is written in the Java code.

node.js Server MySQL database connection timeout (error: connect etimeout)

Node. js server mysql database connection timeout problem
Sometimes connection timeouts occur while the Node server is connecting to the database. This Error is Error: Connect ETIMEDOUT. The error position in the code is line 421 to 433 of mysql’s Connection.js file:

Connection.prototype._handleConnectTimeout = function() {
  if (this._socket) {
    this._socket.setTimeout(0);
    this._socket.destroy();
  }

  var err = new Error('connect ETIMEDOUT');
  err.errorno = 'ETIMEDOUT';
  err.code = 'ETIMEDOUT';
  err.syscall = 'connect';

  this._handleNetworkError(err);
};

This error is literally a connection timeout, and then my error is due to the database connection problem, when creating the database should carefully compare the parameters of the problem, like me:
when creating the database connection pool:

pool = mysql.createPool({  
        host: "127.0.0.1",
        user: "user",
        password: "",
        database: "nodejs",
        port: 3306,
    });

The header information in the database is:

Source Server         : localhost
Source Server Version : 50624
Source Host           : localhost:3306
Source Database       : nodejs

Target Server Type    : MYSQL
Target Server Version : 50624
File Encoding         : 65001

It can be seen that there is a problem with the connection address of the server, so the connection was successful after changing to localhost

Error: ENOENT: no such file or directory, open ‘E:\Program Files\nodejs\tmp\upload_38b32f25bc984333c

Look at the picture first:

The main reason for this problem is that the files you are uploading are not in the same folder
So put the folder TMP and the running JS files in the same directory, as shown in the figure below:

Then the path is changed. The first path I wrote was fs.readfile (“/ TMP /test.png”…) There is no problem changing “/ TMP /test.png” to “./ TMP /test.png”
Fs. ReadFile (“./TMP/test. The PNG “, “binary”, function (the error, the file) {
if (error) {
response. WriteHead (500, {” content-type “:” text/plain “});
response. Write (error + “\ n”);
the response. The end ();
} else {
response. WriteHead (200, {” content-type “:” image/PNG} “);
response. Write (file, “binary”);
the response. The end ();

}});

How to use it RegAsm.exe Register C in a development / production environment#/ VB.NET Developed DLL

The original address: http://www.geeksengine.com/article/register-dll.html thanks to original author
After you create a C# or VB.Net DLL, you need to register it on the target machine. You can use Microsoft’s RegAsm. Exe utility.
Regasm. Exe is an assembly registration tool for reading metadata in an assembly. And add the required items to the registry. The registry allows COM clients (VB6 applications or Microsoft VBA, such as Access, Excel, etc.) to create.net Framework classes. Once a class is registered, it can be used in any COM client as if it were a COM class. Class is registered only once when the assembly is installed. An instance of a class in an assembly cannot be created from COM until it is actually registered.
Description:
The PATH of Regasm. Exe is not in the PATH environment variable added by the system, so the Regasm command is not recognized. When used, DOS Windows need to switch to its storage path before running. \Windows\ Framework\ V2.0.50727 \ Different versions of the system, there may be some differences in the Numbers in the transport path, as explained below:

    2.0,3.0, 3.5, etc.Net Framework USES the same RegAsm. Exe, which is located in the.Net Framework v2.0 folder in the following path. \ \Windows\ \Microsoft \ t.NET\ (32 bit Framework) \ V2.0.50727 \ RegAsm. Exe \ Or \Windows\ \.net \Framework64 (64 bit Framework) \ V2.0.50727 \ RegAsm The Framework USES a new RegAsm. Exe, which is located in the.net Framework v4.0 folder. C:\Windows\Microsoft.NET \ Framework (32-bit) Framework Framework \ v4.0.30319 \ RegAsm exe or C:\Windows\Microsoft.NET \ Framework64 (64) Framework Framework \ v4.0.30319 \ RegAsm exe
    1: RegAsm. Exe and DLL mapping
    If you receive this error “RegAsm: error RA0000: could not load” C: \ Windows\ System32 \ Simplecalc.dll because it is not a valid.net assembly “, you may be registering with RegAsm. Exe under.Net4 version. DLL created above.

    . The.net Framework

    		RegAsm. Exe default installation path

    		your DLL created Framework version

    , the.net Framework 3.5/2.0/3.0

    		C: \ Windows\ Microsoft t.net \ (32/64 bit Framework) \ V2.0.50727 \ RegAsm. Exe .Net Framework 2.0/3.0/3.5
    .Net Framework 4.0, 4.5, 4.6 C: \ Windows\ Microsoft t.net \ (32/64-bit Framework Framework) \ v4.0.30319 \ RegAsm. Exe .net Framework 4.0, 4.5, 4.6

    So when registering DLL assemblies created by the.NET Framework version 4 or above, we cannot register using RegAsm. Exe in the.net Framework 2.0/3.0/3.5 folder.

    2: How do I run RegAsm. Exe
    To execute RegAsm. Exe, open a command prompt window with administrator privileges, switch to the folder where RegAsm. Exe resides and run it (otherwise you will get an error message saying “RegAsm is not recognized as an internal or external command, an actionable program, or a batch file”).
    Switch to the folder where RegAsm. Exe resides and run it

    Assuming I have added my DLL to folder C: \ Windows\ System32, I can run the following command:
    C:\ Windows\ Microsoft t.NET \ Framework \ v4.0.30319 \ RegAsm. Exe Simplecalc.DLL/codebase
    Note that you do not need to specify C: \ Windows\ System32 in the command because it is the system folder. RegAsm. Exe will automatically look for simplecalc.DLL in the C: \ Windows\ System32 directory.
    The/codebase parameter is an optional parameter that adds information about a DLL to the Windows registry, which specifies the path to the assembly on disk.

    3: Regasm can also be used to log out DLLS
    If you get a DLL that does not have a type library file associated with it, you can generate it using the Regasm utility and/TLB option.
    C:\ Windows\ Microsoft t.NET \ Framework \ v4.0.30319 \ RegAsm. Exe Simplecalc.DLL/TLB: Simplecalc.TLB

    Please note that to export a type library from a DLL, you need to have administrator privileges on your computer, otherwise you will receive such an error “RegAsm: Error RA0000: Error saving exported type library: access denied… “Because the account you are running Regasm. Exe is not entitled to write to the folder.
    Note that you can create environment variables for egAsm. Exe under the.NET Framework to simplify DLL registration.

    4: Regasm can also register programs using batch commands
    If you need to register on more than one computer, or if you have a large number of DLL components to register, you can use the following batch command to register.
    @echo off
    Set the path = C:\Windows\Microsoft.NET \ Framework64 \ v4.0.30319 \; %path%
    RegAsm/codebase C: \ Windows \ System32 \ SimpleCalc DLL
    pause
    ::C:\Windows\System32\ Simplecalc. DELL for component and store full path
    : : C:\Windows\Microsoft.NET \ Framework64 \ v4.0.30319 \; Is the folder path where REGASM.EXE resides.
    Note: After saving the above batch command as CMD.bat, double-click to complete the registration. When the registration is unsuccessful, right-click on the CMd.bat file and select run as administrator to complete the registration.
    Happy coding to you!
    Other references:
    https://msdn.microsoft.com/zh-cn/library/tzat5yw6(VS.80).aspx
    http://jingyan.baidu.com/article/09ea3ede65a7c8c0aede39c1.html

    Other article series:

    (1) how to correctly create Access or Excel the DLL (or use in any Microsoft Office applications or VB6) http://blog.csdn.net/kongwei521/article/details/77921436
    (2) how to correctly will c # or VB.Net DLL in the development of machines or generate environment registered in http://blog.csdn.net/kongwei521/article/details/77929273
    (3) how to correctly reference to Access within the Access VBA or Excel VBA c # write DLL http://blog.csdn.net/kongwei521/article/details/77929277 or VB.Net

Reason: error reading from remote server

A long, long time ago, muddled configuration success, a long, long time after configuration or not, then Baidu to CSDN to see each text, and then still unsuccessful, tips are as follows:
Proxy Error

The proxy server could not handle The request POST /redmine/admin/test_email.
Reason: Error reading from remote server
 
The premise of the story begins like this: Once upon a time there was a lazy and stupid person, have to have a brag system to display their own diligence and wisdom, then, a key to found the Windows install Redmine – 3.4.6-1 to show (installation package download address: https://bitnami.com/stack/redmine/installer), and then, and then to the mailbox, configuration, Find the information and then find the file configuration. Yml (my path D:\redmine-3.4.6-1\apps\ Redmine \htdocs\config). Since I am self-aware (flying is also immobile), I first backup the file which has been configured in the configuration and which has not been successfully configured. Then change the file to the following to succeed:
Default :
# Outgoing emails configuration
# See the examples below and the Rails guide for more configuration options:
# http://guides.rubyonrails.org/action_mailer_basics.html#action-mailer-configuration
email_delivery:
delivery_method: : SMTP
smtp_settings:
the TLS: True,

# false address: “smtp.exmail.qq.com”
port: 465
domain: “exmail.qq.com”
authentication: : login
enable_starttls_auto: True,
user_name: “[email protected]”
Password: “JBGSNMM”
 
What didn’t work was this (after the page was configured) :
# default configuration options for all environments
default:
# See the examples below and the Rails guide for more configuration options:
# http://guides.rubyonrails.org/action_mailer_basics.html#action-mailer-configuration
email_delivery:
delivery_method: : SMTP
smtp_settings:
the TLS: false
address: Smtp.exmail.qq.com
port: 465
domain: example.net
authentication: :login
enable_starttls_auto: True
# default configuration options for all environments
default:
# Outgoing emails configuration
# See the examples below and the Rails guide for more configuration Options:

# http://guides.rubyonrails.org/action_mailer_basics.html#action-mailer-configuration email_delivery:
delivery_method: : SMTP
smtp_settings:
the TLS:
false
address: smtp.exmail.qq.com port: 465
domain: example.net
authentication: : login
enable_starttls_auto: true
user_name: “[email protected]”
Password: “JBGSNMM”
         
Note: 1. The yML file has been configured on the page before changes are made. After the configuration, the second paragraph is still published in the email, and then the first paragraph is fine.
2, other people also have this error, wrong place is different, but very valuable ha. Refer to the link http://oyqiaojin.blog.163.com/blog/static/594525652011411334509/
Also recommended a very valuable words at https://blog.csdn.net/liumiaocn/article/details/74089940?utm_source=blogxgwz8

Mac installation dart error curl: (35) libresssl SSL_ connect: SSL_ ERROR_ SYSCALL in connection to storage.googleapis.co

!! Close test effectively
MAC installation dart error curl: (35) LibreSSL SSL_connect: SSL_ERROR_SYSCALL in connection to storage.googleapis.com: 443
Install the brew:
Console operation:
1. Install the brew

/bin/zsh -c "$(curl -fsSL https://gitee.com/cunkai/HomebrewCN/raw/master/Homebrew.sh)"

2. Install the dart – lang/dart

brew tap dart-lang/dart

3. Install the dart

brew install dart

If this operation succeeds, it ends
4. Report an error

➜  canvasVueTemp git:(master) ✗ brew install dart      
==> Installing dart from dart-lang/dart
==> Downloading https://storage.googleapis.com/dart-archive/channels/stable/release/2.7.2/sdk/dartsdk-macos-x64-release.zip

curl: (35) LibreSSL SSL_connect: SSL_ERROR_SYSCALL in connection to storage.googleapis.com:443 
Error: An exception occurred within a child process:
  DownloadError: Failed to download resource "dart"
Download failed: https://storage.googleapis.com/dart-archive/channels/stable/release/2.7.2/sdk/dartsdk-macos-x64-release.zip

Solutions:
Resolved Homebrew installation software download failure
When we use Homebrew to install software, the software package download fails due to some special reasons. This is still very common and we can’t change the environment, but we can take advantage of The Homebrew caching feature by manually downloading software in advance.

$ brew install dart
==> Installing dart from dart-lang/dart
==> Downloading https://storage.googleapis.com/dart-archive/channels/stable/release/2.4.1/sdk/dartsdk-macos-x64-release.zip

curl: (56) LibreSSL SSL_read: SSL_ERROR_SYSCALL, errno 54
Error: An exception occurred within a child process:
  DownloadError: Failed to download resource "dart"
Download failed: https://storage.googleapis.com/dart-archive/channels/stable/release/2.4.1/sdk/dartsdk-macos-x64-release.zip

The corresponding software package cannot be successfully downloaded, but Homebrew will tell the software download address:

Download failed: https://storage.googleapis.com/dart-archive/channels/stable/release/2.4.1/sdk/dartsdk-macos-x64-release.zip

So, we can download the software manually. Then we get the cache directory:

$ brew --cache
/Users/shockerli/Library/Caches/Homebrew

Copy the package you just downloaded to this directory:

$ cp ~/Downloads/dartsdk-macos-x64-release.zip /Users/shockerli/Library/Caches/Homebrew/

We execute the installation command again, no accident, so congratulations, successfully solved the problem.
But accidents happen, and unfortunately you, like me, find that you still give the wrong report:

$ brew install dart
==> Installing dart from dart-lang/dart
==> Downloading https://storage.googleapis.com/dart-archive/channels/stable/release/2.4.1/sdk/dartsdk-macos

curl: (56) LibreSSL SSL_read: SSL_ERROR_SYSCALL, errno 54
Error: An exception occurred within a child process:
  DownloadError: Failed to download resource "dart"
Download failed: https://storage.googleapis.com/dart-archive/channels/stable/release/2.4.1/sdk/dartsdk-macos-x64-release.zip

So what’s the solution?We add a -v to the command to print the detailed log look:

brew install dart -v
==> Installing dart from dart-lang/dart
/usr/bin/sandbox-exec -f /private/tmp/homebrew20190810-60798-mlb2s.sb nice /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/ruby -W0 -I /usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/simplecov-cobertura-1.3.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/ruby-macho-2.2.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rubocop-rspec-1.35.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rubocop-performance-1.4.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rubocop-0.74.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/unicode-display_width-1.6.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/ruby-progressbar-1.10.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-wait-0.0.9/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-retry-0.6.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-its-1.3.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-3.8.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-mocks-3.8.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-expectations-3.8.4/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-core-3.8.2/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-support-3.8.2/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/ronn-0.7.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rdiscount-2.2.0.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/extensions/universal-darwin-18/2.3.0/rdiscount-2.2.0.1:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rainbow-3.0.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/plist-3.5.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/parser-2.6.3.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/parallel_tests-2.29.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/parallel-1.17.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/mustache-1.1.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/mechanize-2.7.6/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/webrobots-0.1.2/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/ntlm-http-0.1.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/nokogiri-1.10.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/extensions/universal-darwin-18/2.3.0/nokogiri-1.10.3:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/mini_portile2-2.4.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/net-http-persistent-3.1.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/net-http-digest_auth-1.4.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/mime-types-3.2.2/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/mime-types-data-3.2019.0331/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/jaro_winkler-1.5.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/extensions/universal-darwin-18/2.3.0/jaro_winkler-1.5.3:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/http-cookie-1.0.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/hpricot-0.8.6/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/extensions/universal-darwin-18/2.3.0/hpricot-0.8.6:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/domain_name-0.5.20190701/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/unf-0.1.4/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/unf_ext-0.0.7.6/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/extensions/universal-darwin-18/2.3.0/unf_ext-0.0.7.6:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/diff-lcs-1.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/coveralls-0.8.23/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/thor-0.20.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/term-ansicolor-1.7.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/tins-1.21.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/simplecov-0.16.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/simplecov-html-0.10.2/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/docile-1.3.2/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/json-2.2.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/extensions/universal-darwin-18/2.3.0/json-2.2.0:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/connection_pool-2.2.2/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/backports-3.15.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/ast-2.4.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/activesupport-5.2.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/tzinfo-1.2.5/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/thread_safe-0.3.6/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/minitest-5.11.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/i18n-1.6.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/concurrent-ruby-1.1.5/lib:/Library/Ruby/Site/2.3.0:/Library/Ruby/Site/2.3.0/x86_64-darwin18:/Library/Ruby/Site/2.3.0/universal-darwin18:/Library/Ruby/Site:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/vendor_ruby/2.3.0:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/vendor_ruby/2.3.0/x86_64-darwin18:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/vendor_ruby/2.3.0/universal-darwin18:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/vendor_ruby:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/x86_64-darwin18:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/universal-darwin18:/usr/local/Homebrew/Library/Homebrew -- /usr/local/Homebrew/Library/Homebrew/build.rb /usr/local/Homebrew/Library/Taps/dart-lang/homebrew-dart/dart.rb --verbose

==> Downloading https://storage.googleapis.com/dart-archive/channels/stable/release/2.4.1/sdk/dartsdk-macos-x64-release.zip
/usr/bin/curl -q --show-error --user-agent Homebrew/2.1.9-21-g625a780\ \(Macintosh\;\ Intel\ Mac\ OS\ X\ 10.14.2\)\ curl/7.54.0 --fail --location --remote-time --continue-at 0 --output /Users/shockerli/Library/Caches/Homebrew/downloads/4d2412a5d84521393e0e1ecdce0662569e13c2c47762093a760939fa9dd4a917--dartsdk-macos-x64-release.zip.incomplete https://storage.googleapis.com/dart-archive/channels/stable/release/2.4.1/sdk/dartsdk-macos-x64-release.zip
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:--  0:00:43 --:--:--     0
curl: (56) LibreSSL SSL_read: SSL_ERROR_SYSCALL, errno 60
Error: An exception occurred within a child process:
  DownloadError: Failed to download resource "dart"
Download failed: https://storage.googleapis.com/dart-archive/channels/stable/release/2.4.1/sdk/dartsdk-macos-x64-release.zip

Notice this message:

/usr/bin/curl -q --show-error --user-agent Homebrew/2.1.9-21-g625a780\ \(Macintosh\;\ Intel\ Mac\ OS\ X\ 10.14.2\)\ curl/7.54.0 --fail --location --remote-time --continue-at 0 --output /Users/shockerli/Library/Caches/Homebrew/downloads/4d2412a5d84521393e0e1ecdce0662569e13c2c47762093a760939fa9dd4a917--dartsdk-macos-x64-release.zip.incomplete https://storage.googleapis.com/dart-archive/channels/stable/release/2.4.1/sdk/dartsdk-macos-x64-release.zip

We can see that the cache address of Homebrew download Dart is:

/Users/shockerli/Library/Caches/Homebrew/downloads/4d2412a5d84521393e0e1ecdce0662569e13c2c47762093a760939fa9dd4a917--dartsdk-macos-x64-release.zip.incomplete

Incomplete means that the download is not complete, but this is the path to the download file that Homebrew expects.
2. Then we will copy the downloaded package into this path, and remove. Incomplete:

mv ~/Downloads/dartsdk-macos-x64-release.zip /Users/shockerli/Library/Caches/Homebrew/downloads/4d2412a5d84521393e0e1ecdce0662569e13c2c47762093a760939fa9dd4a917--dartsdk-macos-x64-release.zip

At this point, we execute the installation command again:

brew install dart -v
==> Installing dart from dart-lang/dart
/usr/bin/sandbox-exec -f /private/tmp/homebrew20190811-62563-1rnamem.sb nice /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/ruby -W0 -I /usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/simplecov-cobertura-1.3.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/ruby-macho-2.2.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rubocop-rspec-1.35.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rubocop-performance-1.4.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rubocop-0.74.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/unicode-display_width-1.6.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/ruby-progressbar-1.10.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-wait-0.0.9/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-retry-0.6.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-its-1.3.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-3.8.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-mocks-3.8.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-expectations-3.8.4/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-core-3.8.2/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-support-3.8.2/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/ronn-0.7.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rdiscount-2.2.0.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/extensions/universal-darwin-18/2.3.0/rdiscount-2.2.0.1:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rainbow-3.0.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/plist-3.5.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/parser-2.6.3.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/parallel_tests-2.29.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/parallel-1.17.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/mustache-1.1.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/mechanize-2.7.6/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/webrobots-0.1.2/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/ntlm-http-0.1.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/nokogiri-1.10.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/extensions/universal-darwin-18/2.3.0/nokogiri-1.10.3:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/mini_portile2-2.4.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/net-http-persistent-3.1.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/net-http-digest_auth-1.4.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/mime-types-3.2.2/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/mime-types-data-3.2019.0331/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/jaro_winkler-1.5.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/extensions/universal-darwin-18/2.3.0/jaro_winkler-1.5.3:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/http-cookie-1.0.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/hpricot-0.8.6/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/extensions/universal-darwin-18/2.3.0/hpricot-0.8.6:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/domain_name-0.5.20190701/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/unf-0.1.4/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/unf_ext-0.0.7.6/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/extensions/universal-darwin-18/2.3.0/unf_ext-0.0.7.6:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/diff-lcs-1.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/coveralls-0.8.23/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/thor-0.20.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/term-ansicolor-1.7.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/tins-1.21.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/simplecov-0.16.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/simplecov-html-0.10.2/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/docile-1.3.2/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/json-2.2.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/extensions/universal-darwin-18/2.3.0/json-2.2.0:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/connection_pool-2.2.2/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/backports-3.15.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/ast-2.4.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/activesupport-5.2.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/tzinfo-1.2.5/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/thread_safe-0.3.6/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/minitest-5.11.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/i18n-1.6.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/concurrent-ruby-1.1.5/lib:/Library/Ruby/Site/2.3.0:/Library/Ruby/Site/2.3.0/x86_64-darwin18:/Library/Ruby/Site/2.3.0/universal-darwin18:/Library/Ruby/Site:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/vendor_ruby/2.3.0:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/vendor_ruby/2.3.0/x86_64-darwin18:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/vendor_ruby/2.3.0/universal-darwin18:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/vendor_ruby:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/x86_64-darwin18:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/universal-darwin18:/usr/local/Homebrew/Library/Homebrew -- /usr/local/Homebrew/Library/Homebrew/build.rb /usr/local/Homebrew/Library/Taps/dart-lang/homebrew-dart/dart.rb --verbose
==> Downloading https://storage.googleapis.com/dart-archive/channels/stable/release/2.4.1/sdk/dartsdk-macos-x64-release.zip


Already downloaded: /Users/shockerli/Library/Caches/Homebrew/downloads/4d2412a5d84521393e0e1ecdce0662569e13c2c47762093a760939fa9dd4a917--dartsdk-macos-x64-release.zip
==> Verifying 4d2412a5d84521393e0e1ecdce0662569e13c2c47762093a760939fa9dd4a917--dartsdk-macos-x64-release.zip checksum
unzip /Users/shockerli/Library/Caches/Homebrew/downloads/4d2412a5d84521393e0e1ecdce0662569e13c2c47762093a760939fa9dd4a917--dartsdk-macos-x64-release.zip -d /private/tmp/d20190811-62564-1me3qph
cp -pR /private/tmp/d20190811-62564-1me3qph/dart-sdk/. /private/tmp/dart-20190811-62564-hu8qrn/dart-sdk
chmod -Rf +w /private/tmp/d20190811-62564-1me3qph
==> Cleaning
==> Finishing up
ln -s ../Cellar/dart/2.4.1/bin/dart dart
ln -s ../Cellar/dart/2.4.1/bin/dart2aot dart2aot
ln -s ../Cellar/dart/2.4.1/bin/dart2js dart2js
ln -s ../Cellar/dart/2.4.1/bin/dartanalyzer dartanalyzer
ln -s ../Cellar/dart/2.4.1/bin/dartaotruntime dartaotruntime
ln -s ../Cellar/dart/2.4.1/bin/dartdevc dartdevc
ln -s ../Cellar/dart/2.4.1/bin/dartdoc dartdoc
ln -s ../Cellar/dart/2.4.1/bin/dartfmt dartfmt
ln -s ../Cellar/dart/2.4.1/bin/pub pub
/usr/bin/sandbox-exec -f /private/tmp/homebrew20190811-62996-w9cwbv.sb nice /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/ruby -W0 -I /usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/simplecov-cobertura-1.3.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/ruby-macho-2.2.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rubocop-rspec-1.35.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rubocop-performance-1.4.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rubocop-0.74.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/unicode-display_width-1.6.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/ruby-progressbar-1.10.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-wait-0.0.9/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-retry-0.6.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-its-1.3.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-3.8.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-mocks-3.8.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-expectations-3.8.4/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-core-3.8.2/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rspec-support-3.8.2/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/ronn-0.7.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rdiscount-2.2.0.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/extensions/universal-darwin-18/2.3.0/rdiscount-2.2.0.1:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/rainbow-3.0.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/plist-3.5.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/parser-2.6.3.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/parallel_tests-2.29.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/parallel-1.17.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/mustache-1.1.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/mechanize-2.7.6/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/webrobots-0.1.2/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/ntlm-http-0.1.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/nokogiri-1.10.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/extensions/universal-darwin-18/2.3.0/nokogiri-1.10.3:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/mini_portile2-2.4.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/net-http-persistent-3.1.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/net-http-digest_auth-1.4.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/mime-types-3.2.2/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/mime-types-data-3.2019.0331/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/jaro_winkler-1.5.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/extensions/universal-darwin-18/2.3.0/jaro_winkler-1.5.3:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/http-cookie-1.0.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/hpricot-0.8.6/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/extensions/universal-darwin-18/2.3.0/hpricot-0.8.6:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/domain_name-0.5.20190701/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/unf-0.1.4/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/unf_ext-0.0.7.6/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/extensions/universal-darwin-18/2.3.0/unf_ext-0.0.7.6:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/diff-lcs-1.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/coveralls-0.8.23/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/thor-0.20.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/term-ansicolor-1.7.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/tins-1.21.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/simplecov-0.16.1/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/simplecov-html-0.10.2/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/docile-1.3.2/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/json-2.2.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/extensions/universal-darwin-18/2.3.0/json-2.2.0:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/connection_pool-2.2.2/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/backports-3.15.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/ast-2.4.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/activesupport-5.2.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/tzinfo-1.2.5/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/thread_safe-0.3.6/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/minitest-5.11.3/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/i18n-1.6.0/lib:/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.3.0/gems/concurrent-ruby-1.1.5/lib:/Library/Ruby/Site/2.3.0:/Library/Ruby/Site/2.3.0/x86_64-darwin18:/Library/Ruby/Site/2.3.0/universal-darwin18:/Library/Ruby/Site:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/vendor_ruby/2.3.0:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/vendor_ruby/2.3.0/x86_64-darwin18:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/vendor_ruby/2.3.0/universal-darwin18:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/vendor_ruby:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/x86_64-darwin18:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/universal-darwin18:/usr/local/Homebrew/Library/Homebrew -- /usr/local/Homebrew/Library/Homebrew/postinstall.rb /usr/local/Homebrew/Library/Taps/dart-lang/homebrew-dart/dart.rb -v
==> Caveats
Please note the path to the Dart SDK:
  /usr/local/opt/dart/libexec
==> Summary
🍺  /usr/local/Cellar/dart/2.4.1: 387 files, 344.4MB, built in 3 minutes 11 seconds

Homebrew successfully used to cache and install 😆 ~ congratulations to you
 
Address:
https://segmentfault.com/a/1190000020125374
https://shockerli.net/post/homebrew-install-download-error/
(Since SF has been officially closed these two days, in order to avoid other people’s encountering this problem and finding no solution, we make a backup here)