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Note: BaseHTTPRequestHandler doesn't implement any HTTP request; see
SimpleHTTPRequestHandler for simple implementations of GET, HEAD and POST,
and CGIHTTPRequestHandler for CGI scripts.
It does, however, optionally implement HTTP/1.1 persistent connections,
as of version 0.3.
Notes on CGIHTTPRequestHandler
------------------------------
This class implements GET and POST requests to cgi-bin scripts.
If the os.fork() function is not present (e.g. on Windows),
subprocess.Popen() is used as a fallback, with slightly altered semantics.
In all cases, the implementation is intentionally naive -- all
requests are executed synchronously.
SECURITY WARNING: DON'T USE THIS CODE UNLESS YOU ARE INSIDE A FIREWALL
-- it may execute arbitrary Python code or external programs.
Note that status code 200 is sent prior to execution of a CGI script, so
scripts cannot send other status codes such as 302 (redirect).
XXX To do:
- log requests even later (to capture byte count)
- log user-agent header and other interesting goodies
- send error log to separate file
u 0.6u
HTTPServeru BaseHTTPRequestHandleri Nu� <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<title>Error response</title>
</head>
<body>
<h1>Error response</h1>
<p>Error code: %(code)d</p>
<p>Message: %(message)s.</p>
<p>Error code explanation: %(code)s - %(explain)s.</p>
</body>
</html>
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The following explanation of HTTP serves to guide you through the
code as well as to expose any misunderstandings I may have about
HTTP (so you don't need to read the code to figure out I'm wrong
:-).
HTTP (HyperText Transfer Protocol) is an extensible protocol on
top of a reliable stream transport (e.g. TCP/IP). The protocol
recognizes three parts to a request:
1. One line identifying the request type and path
2. An optional set of RFC-822-style headers
3. An optional data part
The headers and data are separated by a blank line.
The first line of the request has the form
<command> <path> <version>
where <command> is a (case-sensitive) keyword such as GET or POST,
<path> is a string containing path information for the request,
and <version> should be the string "HTTP/1.0" or "HTTP/1.1".
<path> is encoded using the URL encoding scheme (using %xx to signify
the ASCII character with hex code xx).
The specification specifies that lines are separated by CRLF but
for compatibility with the widest range of clients recommends
servers also handle LF. Similarly, whitespace in the request line
is treated sensibly (allowing multiple spaces between components
and allowing trailing whitespace).
Similarly, for output, lines ought to be separated by CRLF pairs
but most clients grok LF characters just fine.
If the first line of the request has the form
<command> <path>
(i.e. <version> is left out) then this is assumed to be an HTTP
0.9 request; this form has no optional headers and data part and
the reply consists of just the data.
The reply form of the HTTP 1.x protocol again has three parts:
1. One line giving the response code
2. An optional set of RFC-822-style headers
3. The data
Again, the headers and data are separated by a blank line.
The response code line has the form
<version> <responsecode> <responsestring>
where <version> is the protocol version ("HTTP/1.0" or "HTTP/1.1"),
<responsecode> is a 3-digit response code indicating success or
failure of the request, and <responsestring> is an optional
human-readable string explaining what the response code means.
This server parses the request and the headers, and then calls a
function specific to the request type (<command>). Specifically,
a request SPAM will be handled by a method do_SPAM(). If no
such method exists the server sends an error response to the
client. If it exists, it is called with no arguments:
do_SPAM()
Note that the request name is case sensitive (i.e. SPAM and spam
are different requests).
The various request details are stored in instance variables:
- client_address is the client IP address in the form (host,
port);
- command, path and version are the broken-down request line;
- headers is an instance of email.message.Message (or a derived
class) containing the header information;
- rfile is a file object open for reading positioned at the
start of the optional input data part;
- wfile is a file object open for writing.
IT IS IMPORTANT TO ADHERE TO THE PROTOCOL FOR WRITING!
The first thing to be written must be the response line. Then
follow 0 or more header lines, then a blank line, and then the
actual data (if any). The meaning of the header lines depends on
the command executed by the server; in most cases, when data is
returned, there should be at least one header line of the form
Content-type: <type>/<subtype>
where <type> and <subtype> should be registered MIME types,
e.g. "text/html" or "text/plain".
u Python/i u BaseHTTP/u HTTP/0.9c
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| _ n | j j d d � } | j � d k r%| j d k r%| j d k r%| j � s%d Sn d S( u' Parse a request (internal).
The request should be stored in self.raw_requestline; the results
are in self.command, self.path, self.request_version and
self.headers.
Return True for success, False for failure; on failure, an
error is sent back.
i u
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parse_request st $ u$ BaseHTTPRequestHandler.parse_requestc C s | j d � | j � d S( u7 Decide what to do with an "Expect: 100-continue" header.
If the client is expecting a 100 Continue response, we must
respond with either a 100 Continue or a final response before
waiting for the request body. The default is to always respond
with a 100 Continue. You can behave differently (for example,
reject unauthorized requests) by overriding this method.
This method should either return True (possibly after sending
a 100 Continue response) or send an error response and return
False.
id T( u send_response_onlyu end_headersu True( u self( ( u0 /opt/alt/python33/lib64/python3.3/http/server.pyu handle_expect_100W s
u( BaseHTTPRequestHandler.handle_expect_100c C s& y� | j j d � | _ t | j � d k rY d | _ d | _ d | _ | j d � d S| j so d | _ d S| j � s d Sd | j } t
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You normally don't need to override this method; see the class
__doc__ string for information on how to handle specific HTTP
commands such as GET and POST.
i i u i� Ni u do_i� u Unsupported method (%r)u Request timed out: %r( u rfileu readlineu raw_requestlineu lenu requestlineu request_versionu commandu
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u) BaseHTTPRequestHandler.handle_one_requestc C s1 d | _ | j � x | j s, | j � q Wd S( u& Handle multiple requests if necessary.i N( u close_connectionu handle_one_request( u self( ( u0 /opt/alt/python33/lib64/python3.3/http/server.pyu handle� s
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Arguments are the error code, and a detailed message.
The detailed message defaults to the short entry matching the
response code.
This sends an error response (so it must be called before any
output has been generated), logs the error, and finally sends
a piece of HTML explaining the error to the user.
u ???u code %d, message %su codeu messageu explainu Content-Typeu
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'u! BaseHTTPRequestHandler.send_errorc C sM | j | � | j | | � | j d | j � � | j d | j � � d S( u� Add the response header to the headers buffer and log the
response code.
Also send two standard headers with the server software
version and the current date.
u Serveru DateN( u log_requestu send_response_onlyu send_headeru version_stringu date_time_string( u selfu codeu message( ( u0 /opt/alt/python33/lib64/python3.3/http/server.pyu
send_response� s
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%s %d %s
u latin-1u strictN( u Noneu responsesu request_versionu hasattru _headers_bufferu appendu protocol_versionu encode( u selfu codeu message( ( u0 /opt/alt/python33/lib64/python3.3/http/server.pyu send_response_only� s u) BaseHTTPRequestHandler.send_response_onlyc C s� | j d k rS t | d � s* g | _ n | j j d | | f j d d � � n | j � d k r� | j � d k r� d | _ q� | j � d k r� d
| _ q� n d S( u) Send a MIME header to the headers buffer.u HTTP/0.9u _headers_bufferu %s: %s
u latin-1u strictu
connectionu closei u
keep-alivei N( u request_versionu hasattru _headers_bufferu appendu encodeu loweru close_connection( u selfu keywordu value( ( u0 /opt/alt/python33/lib64/python3.3/http/server.pyu send_header� s u" BaseHTTPRequestHandler.send_headerc C s0 | j d k r, | j j d � | j � n d S( u, Send the blank line ending the MIME headers.u HTTP/0.9s
N( u request_versionu _headers_bufferu appendu
flush_headers( u self( ( u0 /opt/alt/python33/lib64/python3.3/http/server.pyu end_headers� s u" BaseHTTPRequestHandler.end_headersc C s; t | d � r7 | j j d j | j � � g | _ n d S( Nu _headers_buffers ( u hasattru wfileu writeu joinu _headers_buffer( u self( ( u0 /opt/alt/python33/lib64/python3.3/http/server.pyu
flush_headers� s u$ BaseHTTPRequestHandler.flush_headersu -c C s) | j d | j t | � t | � � d S( uN Log an accepted request.
This is called by send_response().
u
"%s" %s %sN( u log_messageu requestlineu str( u selfu codeu size( ( u0 /opt/alt/python33/lib64/python3.3/http/server.pyu log_request� s u" BaseHTTPRequestHandler.log_requestc G s | j | | � d S( u� Log an error.
This is called when a request cannot be fulfilled. By
default it passes the message on to log_message().
Arguments are the same as for log_message().
XXX This should go to the separate error log.
N( u log_message( u selfu formatu args( ( u0 /opt/alt/python33/lib64/python3.3/http/server.pyu log_error� s u BaseHTTPRequestHandler.log_errorc G s1 t j j d | j � | j � | | f � d S( u� Log an arbitrary message.
This is used by all other logging functions. Override
it if you have specific logging wishes.
The first argument, FORMAT, is a format string for the
message to be logged. If the format string contains
any % escapes requiring parameters, they should be
specified as subsequent arguments (it's just like
printf!).
The client ip and current date/time are prefixed to
every message.
u %s - - [%s] %s
N( u sysu stderru writeu address_stringu log_date_time_string( u selfu formatu args( ( u0 /opt/alt/python33/lib64/python3.3/http/server.pyu log_message� s u" BaseHTTPRequestHandler.log_messagec C s | j d | j S( u* Return the server software version string.u ( u server_versionu sys_version( u self( ( u0 /opt/alt/python33/lib64/python3.3/http/server.pyu version_string s u% BaseHTTPRequestHandler.version_stringc C sv | d k r t j � } n t j | � \ } } } } } } } } }
d | j | | | j | | | | | f } | S( u@ Return the current date and time formatted for a message header.u# %s, %02d %3s %4d %02d:%02d:%02d GMTN( u Noneu timeu gmtimeu weekdaynameu monthname( u selfu timestampu yearu monthu dayu hhu mmu ssu wdu yu zu s( ( u0 /opt/alt/python33/lib64/python3.3/http/server.pyu date_time_string s *
u' BaseHTTPRequestHandler.date_time_stringc C s] t j � } t j | � \ } } } } } } } } }
d | | j | | | | | f } | S( u. Return the current time formatted for logging.u %02d/%3s/%04d %02d:%02d:%02d( u timeu localtimeu monthname( u selfu nowu yearu monthu dayu hhu mmu ssu xu yu zu s( ( u0 /opt/alt/python33/lib64/python3.3/http/server.pyu log_date_time_string$ s
* u+ BaseHTTPRequestHandler.log_date_time_stringu Monu Tueu Wedu Thuu Friu Satu Sunu Janu Febu Maru Apru Mayu Junu Julu Augu Sepu Octu Novu Decc C s | j d S( u Return the client address.i ( u client_address( u self( ( u0 /opt/alt/python33/lib64/python3.3/http/server.pyu address_string2 s u% BaseHTTPRequestHandler.address_stringu HTTP/1.0u Continueu! Request received, please continueid u Switching Protocolsu. Switching to new protocol; obey Upgrade headerie u OKu# Request fulfilled, document followsi� u Createdu Document created, URL followsi� u Acceptedu/ Request accepted, processing continues off-linei� u Non-Authoritative Informationu Request fulfilled from cachei� u
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No Contentu" Request fulfilled, nothing follows( u
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This serves files from the current directory and any of its
subdirectories. The MIME type for files is determined by
calling the .guess_type() method.
The GET and HEAD requests are identical except that the HEAD
request omits the actual contents of the file.
u SimpleHTTP/c
C s> | j � } | r: z | j | | j � Wd | j � Xn d S( u Serve a GET request.N( u send_headu copyfileu wfileu close( u selfu f( ( u0 /opt/alt/python33/lib64/python3.3/http/server.pyu do_GET� s
u SimpleHTTPRequestHandler.do_GETc C s# | j � } | r | j � n d S( u Serve a HEAD request.N( u send_headu close( u selfu f( ( u0 /opt/alt/python33/lib64/python3.3/http/server.pyu do_HEAD� s u SimpleHTTPRequestHandler.do_HEADc C s� | j | j � } d } t j j | � r� | j j d � sn | j d � | j d | j d � | j � d SxO d D]7 } t j j | | � } t j j
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This sends the response code and MIME headers.
Return value is either a file object (which has to be copied
to the outputfile by the caller unless the command was HEAD,
and must be closed by the caller under all circumstances), or
None, in which case the caller has nothing further to do.
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preventing some security attacks.
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u CGIHTTPRequestHandler.send_headc C sx t t j j | j � � } | j d d � } | d | � | | d d � } } | | j k rt | | f | _ d Sd S( u3 Test whether self.path corresponds to a CGI script.
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