-
Notifications
You must be signed in to change notification settings - Fork 6
Expand file tree
/
Copy pathhello_world_client.html
More file actions
220 lines (191 loc) · 13.9 KB
/
hello_world_client.html
File metadata and controls
220 lines (191 loc) · 13.9 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>“Hello world” HTTP client — cpp-netlib v0.8 documentation</title>
<link rel="stylesheet" href="_static/cpp-netlib.css" type="text/css" />
<link rel="stylesheet" href="_static/pygments.css" type="text/css" />
<script type="text/javascript">
var DOCUMENTATION_OPTIONS = {
URL_ROOT: '',
VERSION: '0.8',
COLLAPSE_INDEX: false,
FILE_SUFFIX: '.html',
HAS_SOURCE: true
};
</script>
<script type="text/javascript" src="_static/jquery.js"></script>
<script type="text/javascript" src="_static/underscore.js"></script>
<script type="text/javascript" src="_static/doctools.js"></script>
<link rel="top" title="cpp-netlib v0.8 documentation" href="index.html" />
<link rel="up" title="HTTP examples" href="examples_http.html" />
<link rel="next" title="An in-depth look at the cpp-netlib" href="in_depth.html" />
<link rel="prev" title="“Hello world” HTTP server" href="hello_world_server.html" />
</head>
<body>
<div class="document">
<div id="custom-doc" class="yui-t4">
<div id="hd">
<h1><a href="index.html">cpp-netlib v0.8 documentation</a></h1>
<div class="nav">
« <a href="hello_world_server.html" title="&#8220;Hello world&#8221; HTTP server">previous</a>
|
<a href="examples.html" title="Examples" accesskey="U">up</a>
|
<a href="in_depth.html" title="An in-depth look at the <tt class="docutils literal"><span class="pre">cpp-netlib</span></tt>">next</a> »</div>
</div>
<div id="bd">
<div id="yui-main">
<div class="yui-b">
<div class="yui-g" id="hello_world_client">
<div class="section" id="hello-world-http-client">
<span id="id1"></span><h1>“Hello world” HTTP client<a class="headerlink" href="#hello-world-http-client" title="Permalink to this headline">¶</a></h1>
<p>Since we have a “Hello World” HTTP server, let’s then create an HTTP client to
access that server. This client will be similar to the HTTP client we made
earlier in the documentation.</p>
<div class="section" id="the-code">
<h2>The Code<a class="headerlink" href="#the-code" title="Permalink to this headline">¶</a></h2>
<p>We want to create a simple HTTP client that just makes a request to the HTTP
server that we created earlier. This really simple client will look like this:</p>
<div class="highlight-c++"><div class="highlight"><pre><span class="cp">#include <boost/network/protocol/http/client.hpp></span>
<span class="cp">#include <string></span>
<span class="cp">#include <sstream></span>
<span class="cp">#include <iostream></span>
<span class="k">namespace</span> <span class="n">http</span> <span class="o">=</span> <span class="n">boost</span><span class="o">::</span><span class="n">network</span><span class="o">::</span><span class="n">http</span><span class="p">;</span>
<span class="kt">int</span> <span class="n">main</span><span class="p">(</span><span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="o">*</span> <span class="n">argv</span><span class="p">[])</span> <span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="n">argc</span> <span class="o">!=</span> <span class="mi">3</span><span class="p">)</span> <span class="p">{</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o"><<</span> <span class="s">"Usage: "</span> <span class="o"><<</span> <span class="n">argv</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o"><<</span> <span class="s">" address port"</span> <span class="o"><<</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
<span class="k">return</span> <span class="mi">1</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">try</span> <span class="p">{</span>
<span class="n">http</span><span class="o">::</span><span class="n">client</span> <span class="n">client</span><span class="p">;</span>
<span class="n">std</span><span class="o">::</span><span class="n">ostringstream</span> <span class="n">url</span><span class="p">;</span>
<span class="n">url</span> <span class="o"><<</span> <span class="s">"http://"</span> <span class="o"><<</span> <span class="n">argv</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="o"><<</span> <span class="s">":"</span> <span class="o"><<</span> <span class="n">argv</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span> <span class="o"><<</span> <span class="s">"/"</span><span class="p">;</span>
<span class="n">http</span><span class="o">::</span><span class="n">client</span><span class="o">::</span><span class="n">request</span> <span class="n">request</span><span class="p">(</span><span class="n">url</span><span class="p">.</span><span class="n">str</span><span class="p">());</span>
<span class="n">http</span><span class="o">::</span><span class="n">client</span><span class="o">::</span><span class="n">response</span> <span class="n">response</span> <span class="o">=</span>
<span class="n">client</span><span class="p">.</span><span class="n">get</span><span class="p">(</span><span class="n">request</span><span class="p">);</span>
<span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o"><<</span> <span class="n">body</span><span class="p">(</span><span class="n">response</span><span class="p">)</span> <span class="o"><<</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
<span class="p">}</span> <span class="k">catch</span> <span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">exception</span> <span class="o">&</span> <span class="n">e</span><span class="p">)</span> <span class="p">{</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o"><<</span> <span class="n">e</span><span class="p">.</span><span class="n">what</span><span class="p">()</span> <span class="o"><<</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
<span class="k">return</span> <span class="mi">1</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
<div class="section" id="building-the-client">
<h2>Building the Client<a class="headerlink" href="#building-the-client" title="Permalink to this headline">¶</a></h2>
<p>Just like with the HTTP Server and HTTP client example before, we can build this
example by doing the following on the shell:</p>
<div class="highlight-bash"><div class="highlight"><pre><span class="nv">$ </span><span class="nb">cd</span> ~/cpp-netlib
<span class="nv">$ </span>g++ -o hello_world_client <span class="se">\</span>
> libs/network/example/http/hello_world_client.cpp <span class="se">\</span>
> -I<span class="nv">$BOOST_ROOT</span> <span class="se">\</span>
> -I. <span class="se">\</span>
> -L<span class="nv">$BOOST_ROOT</span>/stage/lib <span class="se">\</span>
> -lboost_system <span class="se">\</span>
> -pthread
</pre></div>
</div>
<p>This example can be run from the command line as follows:</p>
<div class="highlight-python"><pre>$ ./hello_world_client 127.0.0.1 8000</pre>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">This assumes that you have the <tt class="docutils literal"><span class="pre">hello_world_server</span></tt> running on
localhost port 8000.</p>
</div>
</div>
<div class="section" id="diving-into-the-code">
<h2>Diving into the Code<a class="headerlink" href="#diving-into-the-code" title="Permalink to this headline">¶</a></h2>
<p>All this example shows is how easy it is to write an HTTP client that connects
to an HTTP server, and gets the body of the response. The relevant lines are:</p>
<div class="highlight-c++"><div class="highlight"><pre><span class="n">http</span><span class="o">::</span><span class="n">client</span> <span class="n">client</span><span class="p">;</span>
<span class="n">http</span><span class="o">::</span><span class="n">client</span><span class="o">::</span><span class="n">request</span> <span class="n">request</span><span class="p">(</span><span class="n">url</span><span class="p">.</span><span class="n">str</span><span class="p">());</span>
<span class="n">http</span><span class="o">::</span><span class="n">client</span><span class="o">::</span><span class="n">response</span> <span class="n">response</span> <span class="o">=</span>
<span class="n">client</span><span class="p">.</span><span class="n">get</span><span class="p">(</span><span class="n">request</span><span class="p">);</span>
<span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o"><<</span> <span class="n">body</span><span class="p">(</span><span class="n">response</span><span class="p">)</span> <span class="o"><<</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
</pre></div>
</div>
<p>You can then imagine using this in an XML-RPC client, where you can craft the
XML-RPC request as payload which you can pass as the body to a request, then
perform the request via HTTP:</p>
<div class="highlight-c++"><div class="highlight"><pre><span class="n">http</span><span class="o">::</span><span class="n">client</span> <span class="n">client</span><span class="p">;</span>
<span class="n">http</span><span class="o">::</span><span class="n">client</span><span class="o">::</span><span class="n">request</span> <span class="n">request</span><span class="p">(</span><span class="s">"http://my.webservice.com/"</span><span class="p">);</span>
<span class="n">http</span><span class="o">::</span><span class="n">client</span><span class="o">::</span><span class="n">response</span> <span class="o">=</span>
<span class="n">client</span><span class="p">.</span><span class="n">post</span><span class="p">(</span><span class="n">request</span><span class="p">,</span> <span class="s">"application/xml"</span><span class="p">,</span> <span class="n">some_xml_string</span><span class="p">);</span>
<span class="n">std</span><span class="o">::</span><span class="n">data</span> <span class="o">=</span> <span class="n">body</span><span class="p">(</span><span class="n">response</span><span class="p">);</span>
</pre></div>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="yui-b" id="sidebar">
<div class="sphinxsidebar">
<div class="sphinxsidebarwrapper">
<h3><a href="index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">“Hello world” HTTP client</a><ul>
<li><a class="reference internal" href="#the-code">The Code</a></li>
<li><a class="reference internal" href="#building-the-client">Building the Client</a></li>
<li><a class="reference internal" href="#diving-into-the-code">Diving into the Code</a></li>
</ul>
</li>
</ul>
<h3>Browse</h3>
<ul>
<li>Prev: <a href="hello_world_server.html">“Hello world” HTTP server</a></li>
<li>Next: <a href="in_depth.html">An in-depth look at the <tt class="docutils literal"><span class="pre">cpp-netlib</span></tt></a></li>
</ul>
<h3>You are here:</h3>
<ul>
<li>
<a href="index.html">cpp-netlib v0.8 documentation</a>
<ul><li><a href="examples.html">Examples</a>
<ul><li><a href="examples_http.html">HTTP examples</a>
<ul><li>“Hello world” HTTP client</li></ul>
</li></ul></li></ul>
</li>
</ul>
<h3>This Page</h3>
<ul class="this-page-menu">
<li><a href="_sources/hello_world_client.txt"
rel="nofollow">Show Source</a></li>
</ul>
<div id="searchbox" style="display: none">
<h3>Quick search</h3>
<form class="search" action="search.html" method="get">
<input type="text" name="q" size="18" />
<input type="submit" value="Go" />
<input type="hidden" name="check_keywords" value="yes" />
<input type="hidden" name="area" value="default" />
</form>
<p class="searchtip" style="font-size: 90%">
Enter search terms or a module, class or function name.
</p>
</div>
<script type="text/javascript">$('#searchbox').show(0);</script>
</div>
</div>
</div>
</div>
<div id="ft">
<div class="nav">
« <a href="hello_world_server.html" title="&#8220;Hello world&#8221; HTTP server">previous</a>
|
<a href="examples.html" title="Examples" accesskey="U">up</a>
|
<a href="in_depth.html" title="An in-depth look at the <tt class="docutils literal"><span class="pre">cpp-netlib</span></tt>">next</a> »</div>
</div>
</div>
<div class="clearer"></div>
</div>
<div class="footer">
documentation automatically generated by <a href="http://sphinx.pocoo.org">Sphinx</a> | style mostly stolen from <a href="http://lettuce.it">lettuce.it</a>
</div>
</body>
</html>