BaseHTTPRequestHandler in .NET

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BaseHTTPRequestHandler
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The BaseHTTPRequestHandler class is a base class that s used if you want to define your own custom HTTP server handlingThe prebuilt handlers such as SimpleHTTPRequestHandler and CGIHTTPRequestHandler inherit from this In Python 2, this class is defined in the BaseHTTPServer module
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BaseHTTPRequestHandler(request, client_address, server)
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Base handler class used to handle HTTP requestsWhen a connection is received, the request and HTTP headers are parsed An attempt is then made to execute a method of the form do_REQUEST based on the request type For example, a 'GET' method invokes do_GET() and a 'POST' method invokes do_POST By default, this class does nothing, so these methods are expected to be defined in subclasses The following class variables are defined for BaseHTTPRequestHandler and can be redefined in subclasses
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BaseHTTPRequestHandlerserver_version
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Specifies the server software version string that the server reports to clients for example, 'ServerName/12'
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BaseHTTPRequestHandlersys_version
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Python system version, such as 'Python/26'
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BaseHTTPRequestHandlererror_message_format
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Format string used to build error messages sent to the clientThe format string is applied to a dictionary containing the attributes code, message, and explain For example:
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'''<head> <title>Error response</title> </head> <body> <h1>Error response</h1> <p>Error code %(code)d <p>Message: %(message)s <p>Error code explanation: %(code)s = %(explain)s </body>'''
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BaseHTTPRequestHandlerprotocol_version
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HTTP protocol version used in responsesThe default is 'HTTP/10'
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BaseHTTPRequestHandlerresponses
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Mapping of integer HTTP error codes to two-element tuples (message, explain) that describe the problem For example, the integer code 404 is mapped to ("Not Found", "Nothing matches the given URI")The integer code and strings in this mapping are use when creating error messages as defined in the error_message_format attribute shown previously When created to handle a connection, an instance, b, of BaseHTTPRequestHandler has the following attributes:
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Attribute
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bclient_address bcommand bpath brequest_version bheaders
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Client address as a tuple (host, port) Request type, such as 'GET', 'POST', 'HEAD', and so on The request path such as '/indexhtml' HTTP version string from the request, such as 'HTTP/10' HTTP headers stored in a mapping object To test for or extract the contents of a header, use dictionary operations such as headername in bheaders or headerval = bheaders[headername] Input stream for reading optional input data This is used when a client is uploading data (for example, during a POST request) Output stream for writing a response back to the client
brfile
bwfile
The following methods are commonly used or redefined in subclasses:
bsend_error(code [, message])
Sends a response for an unsuccessful request code is the numeric HTTP response code message is an optional error message log_error() is called to record the errorThis method creates a complete error response using the error_message_format class variable, sends it to the client, and closes the connection No further operations should be performed after calling this
bsend_response(code [, message])
Sends a response for a successful requestThe HTTP response line is sent, followed by Server and Date headers code is an HTTP response code, and message is an optional message log_request() is called to record the request
bsend_header(keyword, value)
Writes a MIME header entry to the output stream keyword is the header keyword, and value is its valueThis should only be called after send_response()
bend_headers()
Sends a blank line to signal the end of the MIME headers
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blog_request([code [, size]])
Logs a successful request code is the HTTP code, and size is the size of the response in bytes (if available) By default, log_message() is called for logging
blog_error(format, )
Logs an error message By default, log_message() is called for logging
blog_message(format, )
Logs an arbitrary message to sysstderr format is a format string applied to any additional arguments passedThe client address and current time are prefixed to every message Here is an example of creating a custom HTTP server that runs in a separate thread and lets you monitor the contents of a dictionary, interpreting the request path as a key
try: from httpserver import BaseHTTPRequestHandler, HTTPServer except ImportError: from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer class DictRequestHandler(BaseHTTPRequestHandler): def _ _init_ _(self,thedict,*args,**kwargs): selfthedict = thedict BaseHTTPRequestHandler_ _init_ _(self,*args,**kwargs) def do_GET(self): key = selfpath[1:] # Strip the leading '/' if not key in selfthedict: selfsend_error(404, "No such key") else: selfsend_response(200) selfsend_header('content-type','text/plain') selfend_headers() resp = "Key : %s\n" % key resp += "Value: %s\n" % selfthedict[key] selfwfilewrite(respencode('latin-1')) # Example use d = { 'name' : 'Dave', 'values' : [1,2,3,4,5], 'email' : 'dave@dabeazcom' } from functools import partial serv = HTTPServer(("",9000), partial(DictRequestHandler,d)) import threading d_mon = threadingThread(target=servserve_forever) d_monstart() # Py 3 # Py 2
To test this example, run the server and then enter a URL such as http://localhost: 9000/name or http://localhost:9000/values into a browser If it works, you ll see the contents of the dictionary being displayed This example also shows a technique for how to get servers to instantiate handler classes with extra parameters Normally, servers create handlers using a predefined set of arguments that are passed to _ _init_ _() If you want to add additional parameters, use the functoolspartial() function as shownThis creates a callable object that includes your extra parameter but preserves the calling signature expected by the server