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Mark McGranaghan 2019-05-31 13:02:17 -07:00
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1
examples.txt
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@ -60,6 +60,7 @@ Line Filters
Command-Line Arguments Command-Line Arguments
Command-Line Flags Command-Line Flags
Environment Variables Environment Variables
HTTP Clients
Spawning Processes Spawning Processes
Exec'ing Processes Exec'ing Processes
Signals Signals

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examples/http-clients/http-clients.go Normal file
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// The Go standard library comes with excellent support
// for HTTP clients and servers in the `net/http`
// package. In this example we'll use it to issue simple
// HTTP requests.
package main
import (
"bufio"
"fmt"
"net/http"
)
func main() {
// Issue an HTTP GET request to a server. `http.Get` is a
// convenient shortcut around creating an `http.Client`
// object and calling its `Get` method; it uses the
// `http.DefaultClient` object which has useful default
// settings.
resp, err := http.Get("http://gobyexample.com")
if err != nil {
panic(err)
}
defer resp.Body.Close()
// Print the HTTP response status.
fmt.Println("Response status:", resp.Status)
// Print the first 5 lines of the response body.
scanner := bufio.NewScanner(resp.Body)
for i := 0; scanner.Scan() && i < 5; i++ {
fmt.Println(scanner.Text())
}
if err := scanner.Err(); err != nil {
panic(err)
}
}

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examples/http-clients/http-clients.hash Normal file
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@ -0,0 +1,2 @@
ec8fd69aa19e54a7ea05d2a911f09d3a98f0396c
VxYIifr_UuH

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examples/http-clients/http-clients.sh Normal file
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$ go run http-clients.go
Response status: 200 OK
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Go by Example</title>

2
public/environment-variables
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@ -161,7 +161,7 @@ program picks that value up.</p>
<p class="next"> <p class="next">
Next example: <a href="spawning-processes">Spawning Processes</a>. Next example: <a href="http-clients">HTTP Clients</a>.
</p> </p>
<p class="footer"> <p class="footer">

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public/http-clients Normal file
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@ -0,0 +1,157 @@
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Go by Example: HTTP Clients</title>
<link rel=stylesheet href="site.css">
</head>
<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/VxYIifr_UuH"><img title="Run code" class="run" src="data:image/png;base64,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" /></a>
<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="spawning-processes">Spawning Processes</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>
</body>
</html>

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public/index.html
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@ -147,6 +147,8 @@
<li><a href="environment-variables">Environment Variables</a></li> <li><a href="environment-variables">Environment Variables</a></li>
<li><a href="http-clients">HTTP Clients</a></li>
<li><a href="spawning-processes">Spawning Processes</a></li> <li><a href="spawning-processes">Spawning Processes</a></li>
<li><a href="execing-processes">Exec'ing Processes</a></li> <li><a href="execing-processes">Exec'ing Processes</a></li>