HTTP servers sample
This commit is contained in:
Eli Bendersky
Mark McGranaghan
parent
552611bc1c
commit
973da6773f
@ -62,6 +62,7 @@ Command-Line Flags
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Command-Line Subcommands
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Environment Variables
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HTTP Clients
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HTTP Servers
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Spawning Processes
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Exec'ing Processes
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Signals
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50
examples/http-servers/http-servers.go
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50
examples/http-servers/http-servers.go
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@ -0,0 +1,50 @@
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// Writing a basic HTTP server is very easy using the
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// `net/http` package.
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package main
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import (
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"fmt"
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"net/http"
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)
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// A fundamental concept in `net/http` servers is
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// *handlers*. A handler is an object implementing the
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// `http.Handler` interface. A very common way to write
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// a handler is by using the `http.HandlerFunc` adapter
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// on functions with the appropriate signature.
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func hello(w http.ResponseWriter, req *http.Request) {
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// Functions serving as handlers take a
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// `http.ResponseWriter` and a `http.Request` as
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// arguments. The response writer is used to fill in the
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// HTTP response. Here out simple response is just
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// "hello\n".
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fmt.Fprintf(w, "hello\n")
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}
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func headers(w http.ResponseWriter, req *http.Request) {
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// This handler does something a little more
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// sophisticated by reading all the HTTP request
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// headers and echoing them into the response body.
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for name, headers := range req.Header {
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for _, h := range headers {
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fmt.Fprintf(w, "%v: %v\n", name, h)
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}
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}
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}
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func main() {
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// We register our handlers on server routes using the
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// `http.HandleFunc` convenience function. It sets up
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// the *default router* in the `net/http` package and
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// takes a function as an argument.
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http.HandleFunc("/hello", hello)
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http.HandleFunc("/headers", headers)
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// Finally, we call the `ListenAndServe` with the port
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// and a handler. `nil` tells it to use the default
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// router we've just set up.
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http.ListenAndServe(":8090", nil)
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}
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2
examples/http-servers/http-servers.hash
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2
examples/http-servers/http-servers.hash
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@ -0,0 +1,2 @@
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1bffba1944537a9f9d7166a67d7a2b9f4ce2d70e
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hg47WDVcY_W
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6
examples/http-servers/http-servers.sh
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6
examples/http-servers/http-servers.sh
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@ -0,0 +1,6 @@
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# Run the server in the background.
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$ go run examples/http-servers/http-servers.go &
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# Access the `/hello` route.
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$ curl localhost:8090/hello
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hello
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@ -146,7 +146,7 @@ settings.</p>
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<p class="next">
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Next example: <a href="spawning-processes">Spawning Processes</a>.
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Next example: <a href="http-servers">HTTP Servers</a>.
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</p>
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<p class="footer">
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198
public/http-servers
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198
public/http-servers
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@ -0,0 +1,198 @@
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Go by Example: HTTP Servers</title>
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<link rel=stylesheet href="site.css">
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</head>
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<body>
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<div class="example" id="http-servers">
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<h2><a href="./">Go by Example</a>: HTTP Servers</h2>
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<table>
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<tr>
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<td class="docs">
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<p>Writing a basic HTTP server is very easy using the
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<code>net/http</code> package.</p>
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</td>
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<td class="code leading">
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<a href="http://play.golang.org/p/hg47WDVcY_W"><img title="Run code" class="run" src="data:image/png;base64,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" /></a>
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<div class="highlight"><pre><span class="kn">package</span> <span class="nx">main</span>
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</pre></div>
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</td>
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</tr>
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<tr>
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<td class="docs">
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</td>
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<td class="code leading">
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<div class="highlight"><pre><span class="kn">import</span> <span class="p">(</span>
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<span class="s">"fmt"</span>
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<span class="s">"net/http"</span>
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<span class="p">)</span>
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</pre></div>
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</td>
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</tr>
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<tr>
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<td class="docs">
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<p>A fundamental concept in <code>net/http</code> servers is
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<em>handlers</em>. A handler is an object implementing the
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<code>http.Handler</code> interface. A very common way to write
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a handler is by using the <code>http.HandlerFunc</code> adapter
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on functions with the appropriate signature.</p>
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</td>
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<td class="code leading">
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<div class="highlight"><pre><span class="kd">func</span> <span class="nx">hello</span><span class="p">(</span><span class="nx">w</span> <span class="nx">http</span><span class="p">.</span><span class="nx">ResponseWriter</span><span class="p">,</span> <span class="nx">req</span> <span class="o">*</span><span class="nx">http</span><span class="p">.</span><span class="nx">Request</span><span class="p">)</span> <span class="p">{</span>
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</pre></div>
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</td>
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</tr>
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<tr>
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<td class="docs">
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<p>Functions serving as handlers take a
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<code>http.ResponseWriter</code> and a <code>http.Request</code> as
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arguments. The response writer is used to fill in the
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HTTP response. Here out simple response is just
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“hello\n”.</p>
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</td>
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<td class="code leading">
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<div class="highlight"><pre> <span class="nx">fmt</span><span class="p">.</span><span class="nx">Fprintf</span><span class="p">(</span><span class="nx">w</span><span class="p">,</span> <span class="s">"hello\n"</span><span class="p">)</span>
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<span class="p">}</span>
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</pre></div>
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</td>
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</tr>
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<tr>
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<td class="docs">
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</td>
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<td class="code leading">
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<div class="highlight"><pre><span class="kd">func</span> <span class="nx">headers</span><span class="p">(</span><span class="nx">w</span> <span class="nx">http</span><span class="p">.</span><span class="nx">ResponseWriter</span><span class="p">,</span> <span class="nx">req</span> <span class="o">*</span><span class="nx">http</span><span class="p">.</span><span class="nx">Request</span><span class="p">)</span> <span class="p">{</span>
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</pre></div>
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</td>
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</tr>
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<tr>
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<td class="docs">
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<p>This handler does something a little more
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sophisticated by reading all the HTTP request
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headers and echoing them into the response body.</p>
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</td>
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<td class="code leading">
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<div class="highlight"><pre> <span class="k">for</span> <span class="nx">name</span><span class="p">,</span> <span class="nx">headers</span> <span class="o">:=</span> <span class="k">range</span> <span class="nx">req</span><span class="p">.</span><span class="nx">Header</span> <span class="p">{</span>
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<span class="k">for</span> <span class="nx">_</span><span class="p">,</span> <span class="nx">h</span> <span class="o">:=</span> <span class="k">range</span> <span class="nx">headers</span> <span class="p">{</span>
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<span class="nx">fmt</span><span class="p">.</span><span class="nx">Fprintf</span><span class="p">(</span><span class="nx">w</span><span class="p">,</span> <span class="s">"%v: %v\n"</span><span class="p">,</span> <span class="nx">name</span><span class="p">,</span> <span class="nx">h</span><span class="p">)</span>
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<span class="p">}</span>
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<span class="p">}</span>
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<span class="p">}</span>
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</pre></div>
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</td>
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</tr>
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<tr>
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<td class="docs">
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</td>
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<td class="code leading">
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<div class="highlight"><pre><span class="kd">func</span> <span class="nx">main</span><span class="p">()</span> <span class="p">{</span>
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</pre></div>
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</td>
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</tr>
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<tr>
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<td class="docs">
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<p>We register our handlers on server routes using the
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<code>http.HandleFunc</code> convenience function. It sets up
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the <em>default router</em> in the <code>net/http</code> package and
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takes a function as an argument.</p>
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</td>
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<td class="code leading">
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<div class="highlight"><pre> <span class="nx">http</span><span class="p">.</span><span class="nx">HandleFunc</span><span class="p">(</span><span class="s">"/hello"</span><span class="p">,</span> <span class="nx">hello</span><span class="p">)</span>
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<span class="nx">http</span><span class="p">.</span><span class="nx">HandleFunc</span><span class="p">(</span><span class="s">"/headers"</span><span class="p">,</span> <span class="nx">headers</span><span class="p">)</span>
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</pre></div>
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</td>
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</tr>
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<tr>
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<td class="docs">
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<p>Finally, we call the <code>ListenAndServe</code> with the port
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and a handler. <code>nil</code> tells it to use the default
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router we’ve just set up.</p>
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</td>
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<td class="code">
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<div class="highlight"><pre> <span class="nx">http</span><span class="p">.</span><span class="nx">ListenAndServe</span><span class="p">(</span><span class="s">":8090"</span><span class="p">,</span> <span class="kc">nil</span><span class="p">)</span>
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<span class="p">}</span>
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</pre></div>
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</td>
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</tr>
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</table>
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<table>
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<tr>
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<td class="docs">
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<p>Run the server in the background.</p>
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</td>
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<td class="code leading">
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<div class="highlight"><pre><span class="gp">$</span> go run examples/http-servers/http-servers.go <span class="p">&</span>
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</pre></div>
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</td>
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</tr>
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<tr>
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<td class="docs">
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<p>Access the <code>/hello</code> route.</p>
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</td>
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<td class="code">
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<div class="highlight"><pre><span class="gp">$</span> curl localhost:8090/hello
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<span class="go">hello</span>
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</pre></div>
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</td>
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</tr>
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</table>
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<p class="next">
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Next example: <a href="spawning-processes">Spawning Processes</a>.
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</p>
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<p class="footer">
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by <a href="https://markmcgranaghan.com">Mark McGranaghan</a> | <a href="https://github.com/mmcgrana/gobyexample/blob/master/examples/http-servers">source</a> | <a href="https://github.com/mmcgrana/gobyexample#license">license</a>
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</p>
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</div>
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</body>
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</html>
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@ -151,6 +151,8 @@
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<li><a href="http-clients">HTTP Clients</a></li>
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<li><a href="http-servers">HTTP Servers</a></li>
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<li><a href="spawning-processes">Spawning Processes</a></li>
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<li><a href="execing-processes">Exec'ing Processes</a></li>
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