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194 lines
5.5 KiB
Python
194 lines
5.5 KiB
Python
"""HTTP client class
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See the following URL for a description of the HTTP/1.0 protocol:
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http://www.w3.org/hypertext/WWW/Protocols/
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(I actually implemented it from a much earlier draft.)
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Example:
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>>> from httplib import HTTP
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>>> h = HTTP('www.python.org')
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>>> h.putrequest('GET', '/index.html')
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>>> h.putheader('Accept', 'text/html')
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>>> h.putheader('Accept', 'text/plain')
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>>> h.endheaders()
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>>> errcode, errmsg, headers = h.getreply()
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>>> if errcode == 200:
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... f = h.getfile()
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... print f.read() # Print the raw HTML
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...
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<HEAD>
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<TITLE>Python Language Home Page</TITLE>
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[...many more lines...]
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>>>
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Note that an HTTP object is used for a single request -- to issue a
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second request to the same server, you create a new HTTP object.
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(This is in accordance with the protocol, which uses a new TCP
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connection for each request.)
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"""
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import socket
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import string
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import mimetools
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HTTP_VERSION = 'HTTP/1.0'
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HTTP_PORT = 80
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class HTTP:
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"""This class manages a connection to an HTTP server."""
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def __init__(self, host = '', port = 0):
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"""Initialize a new instance.
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If specified, `host' is the name of the remote host to which
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to connect. If specified, `port' specifies the port to which
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to connect. By default, httplib.HTTP_PORT is used.
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"""
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self.debuglevel = 0
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self.file = None
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if host: self.connect(host, port)
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def set_debuglevel(self, debuglevel):
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"""Set the debug output level.
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A non-false value results in debug messages for connection and
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for all messages sent to and received from the server.
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"""
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self.debuglevel = debuglevel
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def connect(self, host, port = 0):
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"""Connect to a host on a given port.
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Note: This method is automatically invoked by __init__,
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if a host is specified during instantiation.
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"""
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if not port:
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i = string.find(host, ':')
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if i >= 0:
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host, port = host[:i], host[i+1:]
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try: port = string.atoi(port)
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except string.atoi_error:
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raise socket.error, "nonnumeric port"
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if not port: port = HTTP_PORT
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self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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if self.debuglevel > 0: print 'connect:', (host, port)
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self.sock.connect(host, port)
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def send(self, str):
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"""Send `str' to the server."""
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if self.debuglevel > 0: print 'send:', `str`
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self.sock.send(str)
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def putrequest(self, request, selector):
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"""Send a request to the server.
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`request' specifies an HTTP request method, e.g. 'GET'.
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`selector' specifies the object being requested, e.g.
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'/index.html'.
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"""
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if not selector: selector = '/'
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str = '%s %s %s\r\n' % (request, selector, HTTP_VERSION)
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self.send(str)
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def putheader(self, header, *args):
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"""Send a request header line to the server.
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For example: h.putheader('Accept', 'text/html')
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"""
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str = '%s: %s\r\n' % (header, string.joinfields(args,'\r\n\t'))
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self.send(str)
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def endheaders(self):
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"""Indicate that the last header line has been sent to the server."""
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self.send('\r\n')
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def getreply(self):
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"""Get a reply from the server.
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Returns a tuple consisting of:
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- server response code (e.g. '200' if all goes well)
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- server response string corresponding to response code
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- any RFC822 headers in the response from the server
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"""
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self.file = self.sock.makefile('rb')
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line = self.file.readline()
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if self.debuglevel > 0: print 'reply:', `line`
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try:
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[ver, code, msg] = string.split(line, None, 2)
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except ValueError:
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try:
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[ver, code] = string.split(line, None, 1)
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msg = ""
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except ValueError:
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self.headers = None
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return -1, line, self.headers
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if ver[:5] != 'HTTP/':
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self.headers = None
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return -1, line, self.headers
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errcode = string.atoi(code)
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errmsg = string.strip(msg)
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self.headers = mimetools.Message(self.file, 0)
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return errcode, errmsg, self.headers
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def getfile(self):
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"""Get a file object from which to receive data from the HTTP server.
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NOTE: This method must not be invoked until getreplies
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has been invoked.
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"""
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return self.file
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def close(self):
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"""Close the connection to the HTTP server."""
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if self.file:
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self.file.close()
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self.file = None
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if self.sock:
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self.sock.close()
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self.sock = None
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def test():
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"""Test this module.
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The test consists of retrieving and displaying the Python
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home page, along with the error code and error string returned
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by the www.python.org server.
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"""
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import sys
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import getopt
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opts, args = getopt.getopt(sys.argv[1:], 'd')
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dl = 0
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for o, a in opts:
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if o == '-d': dl = dl + 1
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host = 'www.python.org'
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selector = '/'
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if args[0:]: host = args[0]
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if args[1:]: selector = args[1]
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h = HTTP()
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h.set_debuglevel(dl)
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h.connect(host)
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h.putrequest('GET', selector)
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h.endheaders()
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errcode, errmsg, headers = h.getreply()
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print 'errcode =', errcode
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print 'errmsg =', errmsg
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print
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if headers:
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for header in headers.headers: print string.strip(header)
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print
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print h.getfile().read()
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if __name__ == '__main__':
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test()
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