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 <section id="module-BaseHTTPServer">
<h1>20.18. <a class="reference internal" href="#module-BaseHTTPServer" title="BaseHTTPServer: Basic HTTP server (base class for SimpleHTTPServer and CGIHTTPServer)."><code class="xref py py-mod docutils literal notranslate">BaseHTTPServer</code></a> — Basic HTTP server<a class="headerlink" href="#module-BaseHTTPServer" title="Permalink to this headline">¶</a></h1>
<div class="admonition note">
Note
The <a class="reference internal" href="#module-BaseHTTPServer" title="BaseHTTPServer: Basic HTTP server (base class for SimpleHTTPServer and CGIHTTPServer)."><code class="xref py py-mod docutils literal notranslate">BaseHTTPServer</code></a> module has been merged into <code class="xref py py-mod docutils literal notranslate">http.server</code> in
Python 3. The <a class="reference internal" href="../glossary.html#term-2to3">2to3</a> tool will automatically adapt imports when
converting your sources to Python 3.
</div>
Source code: <a class="reference external" href="https://github.com/python/cpython/tree/2.7/Lib/BaseHTTPServer.py">Lib/BaseHTTPServer.py</a>
<hr class="docutils" />
This module defines two classes for implementing HTTP servers (Web servers).
Usually, this module isn’t used directly, but is used as a basis for building
functioning Web servers. See the <a class="reference internal" href="simplehttpserver.html#module-SimpleHTTPServer" title="SimpleHTTPServer: This module provides a basic request handler for HTTP servers."><code class="xref py py-mod docutils literal notranslate">SimpleHTTPServer</code></a> and
<a class="reference internal" href="cgihttpserver.html#module-CGIHTTPServer" title="CGIHTTPServer: This module provides a request handler for HTTP servers which can run CGI scripts."><code class="xref py py-mod docutils literal notranslate">CGIHTTPServer</code></a> modules.
The first class, <a class="reference internal" href="#BaseHTTPServer.HTTPServer" title="BaseHTTPServer.HTTPServer"><code class="xref py py-class docutils literal notranslate">HTTPServer</code></a>, is a <a class="reference internal" href="socketserver.html#SocketServer.TCPServer" title="SocketServer.TCPServer"><code class="xref py py-class docutils literal notranslate">SocketServer.TCPServer</code></a>
subclass, and therefore implements the <a class="reference internal" href="socketserver.html#SocketServer.BaseServer" title="SocketServer.BaseServer"><code class="xref py py-class docutils literal notranslate">SocketServer.BaseServer</code></a>
interface. It creates and listens at the HTTP socket, dispatching the requests
to a handler. Code to create and run the server looks like this:
<div class="highlight-default notranslate"><div class="highlight"><pre>def run(server_class=BaseHTTPServer.HTTPServer,
 handler_class=BaseHTTPServer.BaseHTTPRequestHandler):
 server_address = (&#39;&#39;, 8000)
 httpd = server_class(server_address, handler_class)
 httpd.serve_forever()
</pre></div>
</div>
<dl class="py class">
<dt class="sig sig-object py" id="BaseHTTPServer.HTTPServer">
class BaseHTTPServer.HTTPServer(server_address, RequestHandlerClass)<a class="headerlink" href="#BaseHTTPServer.HTTPServer" title="Permalink to this definition">¶</a></dt>
<dd>This class builds on the <code class="xref py py-class docutils literal notranslate">TCPServer</code> class by storing the server
address as instance variables named <code class="xref py py-attr docutils literal notranslate">server_name</code> and
<code class="xref py py-attr docutils literal notranslate">server_port</code>. The server is accessible by the handler, typically
through the handler’s <code class="xref py py-attr docutils literal notranslate">server</code> instance variable.
</dd></dl>

<dl class="py class">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler">
class BaseHTTPServer.BaseHTTPRequestHandler(request, client_address, server)<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler" title="Permalink to this definition">¶</a></dt>
<dd>This class is used to handle the HTTP requests that arrive at the server. By
itself, it cannot respond to any actual HTTP requests; it must be subclassed
to handle each request method (e.g. GET or
POST). <a class="reference internal" href="#BaseHTTPServer.BaseHTTPRequestHandler" title="BaseHTTPServer.BaseHTTPRequestHandler"><code class="xref py py-class docutils literal notranslate">BaseHTTPRequestHandler</code></a> provides a number of class and
instance variables, and methods for use by subclasses.
The handler will parse the request and the headers, then call a method
specific to the request type. The method name is constructed from the
request. For example, for the request method <code class="docutils literal notranslate">SPAM</code>, the <code class="xref py py-meth docutils literal notranslate">do_SPAM()</code>
method will be called with no arguments. All of the relevant information is
stored in instance variables of the handler. Subclasses should not need to
override or extend the <code class="xref py py-meth docutils literal notranslate">__init__()</code> method.
<a class="reference internal" href="#BaseHTTPServer.BaseHTTPRequestHandler" title="BaseHTTPServer.BaseHTTPRequestHandler"><code class="xref py py-class docutils literal notranslate">BaseHTTPRequestHandler</code></a> has the following instance variables:
<dl class="py attribute">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.client_address">
client_address<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.client_address" title="Permalink to this definition">¶</a></dt>
<dd>Contains a tuple of the form <code class="docutils literal notranslate">(host, port)</code> referring to the client’s
address.
</dd></dl>

<dl class="py attribute">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.server">
server<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.server" title="Permalink to this definition">¶</a></dt>
<dd>Contains the server instance.
</dd></dl>

<dl class="py attribute">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.command">
command<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.command" title="Permalink to this definition">¶</a></dt>
<dd>Contains the command (request type). For example, <code class="docutils literal notranslate">'GET'</code>.
</dd></dl>

<dl class="py attribute">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.path">
path<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.path" title="Permalink to this definition">¶</a></dt>
<dd>Contains the request path.
</dd></dl>

<dl class="py attribute">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.request_version">
request_version<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.request_version" title="Permalink to this definition">¶</a></dt>
<dd>Contains the version string from the request. For example, <code class="docutils literal notranslate">'HTTP/1.0'</code>.
</dd></dl>

<dl class="py attribute">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.headers">
headers<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.headers" title="Permalink to this definition">¶</a></dt>
<dd>Holds an instance of the class specified by the <a class="reference internal" href="#BaseHTTPServer.BaseHTTPRequestHandler.MessageClass" title="BaseHTTPServer.BaseHTTPRequestHandler.MessageClass"><code class="xref py py-attr docutils literal notranslate">MessageClass</code></a> class
variable. This instance parses and manages the headers in the HTTP
request.
</dd></dl>

<dl class="py attribute">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.rfile">
rfile<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.rfile" title="Permalink to this definition">¶</a></dt>
<dd>Contains an input stream, positioned at the start of the optional input
data.
</dd></dl>

<dl class="py attribute">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.wfile">
wfile<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.wfile" title="Permalink to this definition">¶</a></dt>
<dd>Contains the output stream for writing a response back to the
client. Proper adherence to the HTTP protocol must be used when writing to
this stream.
</dd></dl>

<a class="reference internal" href="#BaseHTTPServer.BaseHTTPRequestHandler" title="BaseHTTPServer.BaseHTTPRequestHandler"><code class="xref py py-class docutils literal notranslate">BaseHTTPRequestHandler</code></a> has the following class variables:
<dl class="py attribute">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.server_version">
server_version<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.server_version" title="Permalink to this definition">¶</a></dt>
<dd>Specifies the server software version. You may want to override this. The
format is multiple whitespace-separated strings, where each string is of
the form name[/version]. For example, <code class="docutils literal notranslate">'BaseHTTP/0.2'</code>.
</dd></dl>

<dl class="py attribute">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.sys_version">
sys_version<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.sys_version" title="Permalink to this definition">¶</a></dt>
<dd>Contains the Python system version, in a form usable by the
<a class="reference internal" href="#BaseHTTPServer.BaseHTTPRequestHandler.version_string" title="BaseHTTPServer.BaseHTTPRequestHandler.version_string"><code class="xref py py-attr docutils literal notranslate">version_string</code></a> method and the <a class="reference internal" href="#BaseHTTPServer.BaseHTTPRequestHandler.server_version" title="BaseHTTPServer.BaseHTTPRequestHandler.server_version"><code class="xref py py-attr docutils literal notranslate">server_version</code></a> class
variable. For example, <code class="docutils literal notranslate">'Python/1.4'</code>.
</dd></dl>

<dl class="py attribute">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.error_message_format">
error_message_format<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.error_message_format" title="Permalink to this definition">¶</a></dt>
<dd>Specifies a format string for building an error response to the client. It
uses parenthesized, keyed format specifiers, so the format operand must be
a dictionary. The code key should be an integer, specifying the numeric
HTTP error code value. message should be a string containing a
(detailed) error message of what occurred, and explain should be an
explanation of the error code number. Default message and explain
values can found in the responses class variable.
</dd></dl>

<dl class="py attribute">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.error_content_type">
error_content_type<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.error_content_type" title="Permalink to this definition">¶</a></dt>
<dd>Specifies the Content-Type HTTP header of error responses sent to the
client. The default value is <code class="docutils literal notranslate">'text/html'</code>.
<div class="versionadded">
New in version 2.6: Previously, the content type was always <code class="docutils literal notranslate">'text/html'</code>.
</div>
</dd></dl>

<dl class="py attribute">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.protocol_version">
protocol_version<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.protocol_version" title="Permalink to this definition">¶</a></dt>
<dd>This specifies the HTTP protocol version used in responses. If set to
<code class="docutils literal notranslate">'HTTP/1.1'</code>, the server will permit HTTP persistent connections;
however, your server must then include an accurate <code class="docutils literal notranslate">Content-Length</code>
header (using <a class="reference internal" href="#BaseHTTPServer.BaseHTTPRequestHandler.send_header" title="BaseHTTPServer.BaseHTTPRequestHandler.send_header"><code class="xref py py-meth docutils literal notranslate">send_header()</code></a>) in all of its responses to clients.
For backwards compatibility, the setting defaults to <code class="docutils literal notranslate">'HTTP/1.0'</code>.
</dd></dl>

<dl class="py attribute">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.MessageClass">
MessageClass<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.MessageClass" title="Permalink to this definition">¶</a></dt>
<dd>Specifies a <a class="reference internal" href="rfc822.html#rfc822.Message" title="rfc822.Message"><code class="xref py py-class docutils literal notranslate">rfc822.Message</code></a>-like class to parse HTTP headers.
Typically, this is not overridden, and it defaults to
<a class="reference internal" href="mimetools.html#mimetools.Message" title="mimetools.Message"><code class="xref py py-class docutils literal notranslate">mimetools.Message</code></a>.
</dd></dl>

<dl class="py attribute">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.responses">
responses<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.responses" title="Permalink to this definition">¶</a></dt>
<dd>This variable contains a mapping of error code integers to two-element tuples
containing a short and long message. For example, <code class="docutils literal notranslate">{code: (shortmessage,
longmessage)}</code>. The shortmessage is usually used as the message key in an
error response, and longmessage as the explain key (see the
<a class="reference internal" href="#BaseHTTPServer.BaseHTTPRequestHandler.error_message_format" title="BaseHTTPServer.BaseHTTPRequestHandler.error_message_format"><code class="xref py py-attr docutils literal notranslate">error_message_format</code></a> class variable).
</dd></dl>

A <a class="reference internal" href="#BaseHTTPServer.BaseHTTPRequestHandler" title="BaseHTTPServer.BaseHTTPRequestHandler"><code class="xref py py-class docutils literal notranslate">BaseHTTPRequestHandler</code></a> instance has the following methods:
<dl class="py method">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.handle">
handle()<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.handle" title="Permalink to this definition">¶</a></dt>
<dd>Calls <a class="reference internal" href="#BaseHTTPServer.BaseHTTPRequestHandler.handle_one_request" title="BaseHTTPServer.BaseHTTPRequestHandler.handle_one_request"><code class="xref py py-meth docutils literal notranslate">handle_one_request()</code></a> once (or, if persistent connections are
enabled, multiple times) to handle incoming HTTP requests. You should
never need to override it; instead, implement appropriate <code class="xref py py-meth docutils literal notranslate">do_*()</code>
methods.
</dd></dl>

<dl class="py method">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.handle_one_request">
handle_one_request()<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.handle_one_request" title="Permalink to this definition">¶</a></dt>
<dd>This method will parse and dispatch the request to the appropriate
<code class="xref py py-meth docutils literal notranslate">do_*()</code> method. You should never need to override it.
</dd></dl>

<dl class="py method">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.send_error">
send_error(code[, message])<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.send_error" title="Permalink to this definition">¶</a></dt>
<dd>Sends and logs a complete error reply to the client. The numeric code
specifies the HTTP error code, with message as optional, more specific text. A
complete set of headers is sent, followed by text composed using the
<a class="reference internal" href="#BaseHTTPServer.BaseHTTPRequestHandler.error_message_format" title="BaseHTTPServer.BaseHTTPRequestHandler.error_message_format"><code class="xref py py-attr docutils literal notranslate">error_message_format</code></a> class variable. The body will be empty
if the method is HEAD or the response code is one of the following:
<code class="docutils literal notranslate">1xx</code>, <code class="docutils literal notranslate">204 No Content</code>, <code class="docutils literal notranslate">205 Reset Content</code>,
<code class="docutils literal notranslate">304 Not Modified</code>.
</dd></dl>

<dl class="py method">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.send_response">
send_response(code[, message])<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.send_response" title="Permalink to this definition">¶</a></dt>
<dd>Sends a response header and logs the accepted request. The HTTP response
line is sent, followed by Server and Date headers. The values for
these two headers are picked up from the <a class="reference internal" href="#BaseHTTPServer.BaseHTTPRequestHandler.version_string" title="BaseHTTPServer.BaseHTTPRequestHandler.version_string"><code class="xref py py-meth docutils literal notranslate">version_string()</code></a> and
<a class="reference internal" href="#BaseHTTPServer.BaseHTTPRequestHandler.date_time_string" title="BaseHTTPServer.BaseHTTPRequestHandler.date_time_string"><code class="xref py py-meth docutils literal notranslate">date_time_string()</code></a> methods, respectively.
</dd></dl>

<dl class="py method">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.send_header">
send_header(keyword, value)<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.send_header" title="Permalink to this definition">¶</a></dt>
<dd>Writes a specific HTTP header to the output stream. keyword should
specify the header keyword, with value specifying its value.
</dd></dl>

<dl class="py method">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.end_headers">
end_headers()<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.end_headers" title="Permalink to this definition">¶</a></dt>
<dd>Sends a blank line, indicating the end of the HTTP headers in the
response.
</dd></dl>

<dl class="py method">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.log_request">
log_request([code[, size]])<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.log_request" title="Permalink to this definition">¶</a></dt>
<dd>Logs an accepted (successful) request. code should specify the numeric
HTTP code associated with the response. If a size of the response is
available, then it should be passed as the size parameter.
</dd></dl>

<dl class="py method">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.log_error">
log_error(...)<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.log_error" title="Permalink to this definition">¶</a></dt>
<dd>Logs an error when a request cannot be fulfilled. By default, it passes
the message to <a class="reference internal" href="#BaseHTTPServer.BaseHTTPRequestHandler.log_message" title="BaseHTTPServer.BaseHTTPRequestHandler.log_message"><code class="xref py py-meth docutils literal notranslate">log_message()</code></a>, so it takes the same arguments
(format and additional values).
</dd></dl>

<dl class="py method">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.log_message">
log_message(format, ...)<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.log_message" title="Permalink to this definition">¶</a></dt>
<dd>Logs an arbitrary message to <code class="docutils literal notranslate">sys.stderr</code>. This is typically overridden
to create custom error logging mechanisms. The format argument is a
standard printf-style format string, where the additional arguments to
<a class="reference internal" href="#BaseHTTPServer.BaseHTTPRequestHandler.log_message" title="BaseHTTPServer.BaseHTTPRequestHandler.log_message"><code class="xref py py-meth docutils literal notranslate">log_message()</code></a> are applied as inputs to the formatting. The client
ip address and current date and time are prefixed to every message logged.
</dd></dl>

<dl class="py method">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.version_string">
version_string()<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.version_string" title="Permalink to this definition">¶</a></dt>
<dd>Returns the server software’s version string. This is a combination of the
<a class="reference internal" href="#BaseHTTPServer.BaseHTTPRequestHandler.server_version" title="BaseHTTPServer.BaseHTTPRequestHandler.server_version"><code class="xref py py-attr docutils literal notranslate">server_version</code></a> and <a class="reference internal" href="#BaseHTTPServer.BaseHTTPRequestHandler.sys_version" title="BaseHTTPServer.BaseHTTPRequestHandler.sys_version"><code class="xref py py-attr docutils literal notranslate">sys_version</code></a> class variables.
</dd></dl>

<dl class="py method">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.date_time_string">
date_time_string([timestamp])<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.date_time_string" title="Permalink to this definition">¶</a></dt>
<dd>Returns the date and time given by timestamp (which must be in the
format returned by <a class="reference internal" href="time.html#time.time" title="time.time"><code class="xref py py-func docutils literal notranslate">time.time()</code></a>), formatted for a message header. If
timestamp is omitted, it uses the current date and time.
The result looks like <code class="docutils literal notranslate">'Sun, 06 Nov 1994 08:49:37 GMT'</code>.
<div class="versionadded">
New in version 2.5: The timestamp parameter.
</div>
</dd></dl>

<dl class="py method">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.log_date_time_string">
log_date_time_string()<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.log_date_time_string" title="Permalink to this definition">¶</a></dt>
<dd>Returns the current date and time, formatted for logging.
</dd></dl>

<dl class="py method">
<dt class="sig sig-object py" id="BaseHTTPServer.BaseHTTPRequestHandler.address_string">
address_string()<a class="headerlink" href="#BaseHTTPServer.BaseHTTPRequestHandler.address_string" title="Permalink to this definition">¶</a></dt>
<dd>Returns the client address, formatted for logging. A name lookup is
performed on the client’s IP address.
</dd></dl>

</dd></dl>

<section id="more-examples">
<h2>20.18.1. More examples<a class="headerlink" href="#more-examples" title="Permalink to this headline">¶</a></h2>
To create a server that doesn’t run forever, but until some condition is
fulfilled:
<div class="highlight-default notranslate"><div class="highlight"><pre>def run_while_true(server_class=BaseHTTPServer.HTTPServer,
 handler_class=BaseHTTPServer.BaseHTTPRequestHandler):
 &quot;&quot;&quot;
 This assumes that keep_running() is a function of no arguments which
 is tested initially and after each request. If its return value
 is true, the server continues.
 &quot;&quot;&quot;
 server_address = (&#39;&#39;, 8000)
 httpd = server_class(server_address, handler_class)
 while keep_running():
 httpd.handle_request()
</pre></div>
</div>
<div class="admonition seealso">
See also
<dl class="simple">
<dt>Module <a class="reference internal" href="cgihttpserver.html#module-CGIHTTPServer" title="CGIHTTPServer: This module provides a request handler for HTTP servers which can run CGI scripts."><code class="xref py py-mod docutils literal notranslate">CGIHTTPServer</code></a></dt><dd>Extended request handler that supports CGI scripts.
</dd>
<dt>Module <a class="reference internal" href="simplehttpserver.html#module-SimpleHTTPServer" title="SimpleHTTPServer: This module provides a basic request handler for HTTP servers."><code class="xref py py-mod docutils literal notranslate">SimpleHTTPServer</code></a></dt><dd>Basic request handler that limits response to files actually under the
document root.
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