yeray/gobyexample
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
gobyexample/public/http-clients
Hana 9e216da9ef go.mod: add go.mod and move pygments to third_party 
After go1.16, go will use module mode by default,
even when the repository is checked out under GOPATH
or in a one-off directory. Add go.mod, go.sum to keep
this repo buildable without opting out of the module
mode.

> go mod init github.com/mmcgrana/gobyexample
> go mod tidy
> go mod vendor

In module mode, the 'vendor' directory is special
and its contents will be actively maintained by the
go command. pygments aren't the dependency the go will
know about, so it will delete the contents from vendor
directory. Move it to `third_party` directory now.

And, vendor the blackfriday package.

Note: the tutorial contents are not affected by the
change in go1.16 because all the examples in this
tutorial ask users to run the go command with the
explicit list of files to be compiled (e.g.
`go run hello-world.go` or `go build command-line-arguments.go`).
When the source list is provided, the go command does
not have to compute the build list and whether it's
running in GOPATH mode or module mode becomes irrelevant.
2021-02-15 16:45:26 -05:00

177 lines
7.4 KiB
Plaintext
Generated
Raw Blame History

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Go by Example: HTTP Clients</title>
<link rel=stylesheet href="site.css">
</head>
<script>
onkeydown = (e) => {
if (e.key == "ArrowLeft") {
window.location.href = 'environment-variables';
}
if (e.key == "ArrowRight") {
window.location.href = 'http-servers';
}
}
</script>
<body>
<div class="example" id="http-clients">
<h2><a href="./">Go by Example</a>: HTTP Clients</h2>
<table>
<tr>
<td class="docs">
<p>The Go standard library comes with excellent support
for HTTP clients and servers in the <code>net/http</code>
package. In this example we&rsquo;ll use it to issue simple
HTTP requests.</p>
</td>
<td class="code leading">
<a href="http://play.golang.org/p/kHCcVLoz7nd"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
<div class="highlight"><pre><span class="kn">package</span> <span class="nx">main</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<div class="highlight"><pre><span class="kn">import</span> <span class="p">(</span>
<span class="s">&quot;bufio&quot;</span>
<span class="s">&quot;fmt&quot;</span>
<span class="s">&quot;net/http&quot;</span>
<span class="p">)</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<div class="highlight"><pre><span class="kd">func</span> <span class="nx">main</span><span class="p">()</span> <span class="p">{</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Issue an HTTP GET request to a server. <code>http.Get</code> is a
convenient shortcut around creating an <code>http.Client</code>
object and calling its <code>Get</code> method; it uses the
<code>http.DefaultClient</code> object which has useful default
settings.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">resp</span><span class="p">,</span> <span class="nx">err</span> <span class="o">:=</span> <span class="nx">http</span><span class="p">.</span><span class="nx">Get</span><span class="p">(</span><span class="s">&quot;http://gobyexample.com&quot;</span><span class="p">)</span>
<span class="k">if</span> <span class="nx">err</span> <span class="o">!=</span> <span class="kc">nil</span> <span class="p">{</span>
<span class="nb">panic</span><span class="p">(</span><span class="nx">err</span><span class="p">)</span>
<span class="p">}</span>
<span class="k">defer</span> <span class="nx">resp</span><span class="p">.</span><span class="nx">Body</span><span class="p">.</span><span class="nx">Close</span><span class="p">()</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Print the HTTP response status.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">fmt</span><span class="p">.</span><span class="nx">Println</span><span class="p">(</span><span class="s">&quot;Response status:&quot;</span><span class="p">,</span> <span class="nx">resp</span><span class="p">.</span><span class="nx">Status</span><span class="p">)</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Print the first 5 lines of the response body.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">scanner</span> <span class="o">:=</span> <span class="nx">bufio</span><span class="p">.</span><span class="nx">NewScanner</span><span class="p">(</span><span class="nx">resp</span><span class="p">.</span><span class="nx">Body</span><span class="p">)</span>
<span class="k">for</span> <span class="nx">i</span> <span class="o">:=</span> <span class="mi">0</span><span class="p">;</span> <span class="nx">scanner</span><span class="p">.</span><span class="nx">Scan</span><span class="p">()</span> <span class="o">&amp;&amp;</span> <span class="nx">i</span> <span class="p">&lt;</span> <span class="mi">5</span><span class="p">;</span> <span class="nx">i</span><span class="o">++</span> <span class="p">{</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nx">Println</span><span class="p">(</span><span class="nx">scanner</span><span class="p">.</span><span class="nx">Text</span><span class="p">())</span>
<span class="p">}</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code">
<div class="highlight"><pre> <span class="k">if</span> <span class="nx">err</span> <span class="o">:=</span> <span class="nx">scanner</span><span class="p">.</span><span class="nx">Err</span><span class="p">();</span> <span class="nx">err</span> <span class="o">!=</span> <span class="kc">nil</span> <span class="p">{</span>
<span class="nb">panic</span><span class="p">(</span><span class="nx">err</span><span class="p">)</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</td>
</tr>
</table>
<table>
<tr>
<td class="docs">
</td>
<td class="code">
<div class="highlight"><pre><span class="gp">$</span> go run http-clients.go
<span class="go">Response status: 200 OK</span>
<span class="go">&lt;!DOCTYPE html&gt;</span>
<span class="go">&lt;html&gt;</span>
<span class="go"> &lt;head&gt;</span>
<span class="go"> &lt;meta charset=&quot;utf-8&quot;&gt;</span>
<span class="go"> &lt;title&gt;Go by Example&lt;/title&gt;</span>
</pre></div>
</td>
</tr>
</table>
<p class="next">
Next example: <a href="http-servers">HTTP Servers</a>.
</p>
<p class="footer">
by <a href="https://markmcgranaghan.com">Mark McGranaghan</a> | <a href="https://github.com/mmcgrana/gobyexample/blob/master/examples/http-clients">source</a> | <a href="https://github.com/mmcgrana/gobyexample#license">license</a>
</p>
</div>
<script>
var codeLines = [];
codeLines.push('package main\u000A');codeLines.push('import (\u000A \"bufio\"\u000A \"fmt\"\u000A \"net/http\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' resp, err :\u003D http.Get(\"http://gobyexample.com\")\u000A if err !\u003D nil {\u000A panic(err)\u000A }\u000A defer resp.Body.Close()\u000A');codeLines.push(' fmt.Println(\"Response status:\", resp.Status)\u000A');codeLines.push(' scanner :\u003D bufio.NewScanner(resp.Body)\u000A for i :\u003D 0; scanner.Scan() \u0026\u0026 i \u003C 5; i++ {\u000A fmt.Println(scanner.Text())\u000A }\u000A');codeLines.push(' if err :\u003D scanner.Err(); err !\u003D nil {\u000A panic(err)\u000A }\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>
</html>
Reference in New Issue View Git Blame Copy Permalink