# Python 2 # Python 3 in Visual Studio .NET

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# Python 2 # Python 3
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# Send all form sections for s in formsections: connsend(sencode('latin-1')) # Send all files for head,filename in zip(fileheaders,filefieldsvalues()): connsend(headencode('latin-1')) f = open(filename,"rb") while True: chunk = fread(16384) if not chunk: break connsend(chunk) fclose() connsend(closingencode('latin-1')) r = conngetresponse() responsedata = rread() connclose() return responsedata # Sample: Upload some files The form fields 'name', 'email' # 'file_1','file_2', and so forth are what the remote server # is expecting (obviously this will vary) server = ('localhost', 8080) url = '/cgi-bin/uploadpy' formfields = { 'name' : 'Dave', 'email' : 'dave@dabeazcom' } filefields = { 'file_1' : 'IMG_1008JPG', 'file_2' : 'IMG_1757JPG' } resp = upload(server, url,formfields,filefields) print(resp)
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httpserver (BaseHTTPServer, CGIHTTPServer, SimpleHTTPServer)
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The httpserver module provides various classes for implementing HTTP servers In Python 2, the contents of this module are split across three library modules: BaseHTTPServer, CGIHTTPServer, and SimpleHTTPServer
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The following class implements a basic HTTP server In Python 2, it is located in the BaseHTTPServer module
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HTTPServer(server_address, request_handler)
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Creates a new HTTPServer object server_address is a tuple of the form (host, port) on which the server will listen request_handler is a handler class derived from BaseHTTPRequestHandler, which is described later HTTPServer inherits directly from TCPServer defined in the socketserver moduleThus, if you want to customize the operation of the HTTP server in any way, you
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inherit from HTTPServer and extend it Here is how you would define a multithreaded HTTP server that only accepts connections from a specific subnet:
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try: from httpserver import HTTPServer from socketserver import ThreadingMixIn except ImportError: from BaseHTTPServer import HTTPServer from SocketServer import ThreadingMixIn # Python 3
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# Python 2
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class MyHTTPServer(ThreadingMixIn,HTTPServer): def _ _init_ _(self,addr,handler,subnet): HTTPServer_ _init_ _(self,addr,handler) selfsubnet = subnet def verify_request(self, request, client_address): host, port = client_address if not hoststartswith(subnet): return False return HTTPSerververify_request(self,request,client_address) # Example of how the server runs serv = MyHTTPServer(('',8080), SomeHandler, '19216869') servserve_forever()
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The HTTPServer class only deals with the low-level HTTP protocolTo get the server to actually do anything, you have to supply a handler classThere are two built-in handlers and a base class that can be used for defining your own custom handlingThese are described next
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SimpleHTTPRequestHandler and CGIHTTPRequestHandler
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Two prebuilt web server handler classes can be used if you want to quickly set up a simple stand-alone web serverThese classes operate independently of any third-party web server such as Apache
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CGIHTTPRequestHandler(request, client_address, server)
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Serves files from the current directory and all its subdirectories In addition, the handler will run a file as a CGI script if it s located in a special CGI directory (defined by the cgi_directories class variable which is set to ['/cgi-bin', '/htbin'] by default)The handler supports GET, HEAD, and POST methods However, it does not support HTTP redirects (HTTP code 302), which limits its use to only more simple CGI applications For security purposes, CGI scripts are executed with a UID of nobody In Python 2, this class is defined in the CGIHTTPServer module
SimpleHTTPRequestHandler(request, client_address, server)
Serves files from the current directory and all its subdirectoriesThe class provides support for HEAD and GET requests, respectively All IOError exceptions result in a "404 File not found" error Attempts to access a directory result in a "403 Directory listing not supported" error In Python 2, this class is defined in the SimpleHTTPServer module Both of these handlers define the following class variables that can be changed via inheritance if desired:
handlerserver_version
Server version string returned to clients By default, this is set to a string such as 'SimpleHTTP/06'
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22 Internet Application Programming
handlerextensions_map
A dictionary mapping suffixes to MIME types Unrecognized file types are considered to be of type 'application/octet-stream' Here is an example of using these handler classes to run a stand-alone web server capable of running CGI scripts:
try: from httpserver import HTTPServer, CGIHTTPRequestHandler # Python 3 except ImportError: from BaseHTTPServer import HTTPServer # Python 2 from CGIHTTPServer import CGIHTTPRequestHandler import os # Change to the document root oschdir("/home/httpd/html") # Start the CGIHTTP server on port 8080 serv = HTTPServer(("",8080),CGIHTTPRequestHandler) servserve_forever()