Mercurial > cpython-lru_cache-weakref
annotate Doc/libhttplib.tex @ 4566:6403c94de50d legacy-trunk
Added safeguard against failure in __del__.
| author | Guido van Rossum <guido@python.org> |
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| date | Wed, 27 Nov 1996 19:39:58 +0000 |
| parents | 7ef72873e4d6 |
| children | 6fda1e6e2616 |
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1 \section{Standard Module \sectcode{httplib}} |
| 2449 | 2 \stmodindex{httplib} |
| 3 \index{HTTP} | |
| 4 | |
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5 \renewcommand{\indexsubitem}{(in module httplib)} |
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6 |
| 2449 | 7 This module defines a class which implements the client side of the |
| 8 HTTP protocol. It is normally not used directly --- the module | |
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9 \code{urllib} uses it to handle URLs that use HTTP. |
| 2449 | 10 \stmodindex{urllib} |
| 11 | |
| 12 The module defines one class, \code{HTTP}. An \code{HTTP} instance | |
| 13 represents one transaction with an HTTP server. It should be | |
| 14 instantiated passing it a host and optional port number. If no port | |
| 15 number is passed, the port is extracted from the host string if it has | |
| 16 the form \code{host:port}, else the default HTTP port (80) is used. | |
| 17 If no host is passed, no connection is made, and the \code{connect} | |
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18 method should be used to connect to a server. For example, the |
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19 following calls all create instances that connect to the server at the |
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20 same host and port: |
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21 |
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22 \begin{verbatim} |
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23 >>> h1 = httplib.HTTP('www.cwi.nl') |
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24 >>> h2 = httplib.HTTP('www.cwi.nl:80') |
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25 >>> h3 = httplib.HTTP('www.cwi.nl', 80) |
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26 \end{verbatim} |
| 2449 | 27 |
| 28 Once an \code{HTTP} instance has been connected to an HTTP server, it | |
| 29 should be used as follows: | |
| 30 | |
| 31 \begin{enumerate} | |
| 32 | |
| 33 \item[1.] Make exactly one call to the \code{putrequest()} method. | |
| 34 | |
| 35 \item[2.] Make zero or more calls to the \code{putheader()} method. | |
| 36 | |
| 37 \item[3.] Call the \code{endheaders()} method (this can be omitted if | |
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38 step 4 makes no calls). |
| 2449 | 39 |
| 40 \item[4.] Optional calls to the \code{send()} method. | |
| 41 | |
| 42 \item[5.] Call the \code{getreply()} method. | |
| 43 | |
| 44 \item[6.] Call the \code{getfile()} method and read the data off the | |
| 45 file object that it returns. | |
| 46 | |
| 47 \end{enumerate} | |
| 48 | |
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49 \subsection{HTTP Objects} |
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50 |
| 2449 | 51 \code{HTTP} instances have the following methods: |
| 52 | |
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53 \renewcommand{\indexsubitem}{(HTTP method)} |
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54 |
| 2449 | 55 \begin{funcdesc}{set_debuglevel}{level} |
| 56 Set the debugging level (the amount of debugging output printed). | |
| 57 The default debug level is \code{0}, meaning no debugging output is | |
| 58 printed. | |
| 59 \end{funcdesc} | |
| 60 | |
| 61 \begin{funcdesc}{connect}{host\optional{\, port}} | |
| 62 Connect to the server given by \var{host} and \var{port}. See the | |
| 63 intro for the default port. This should be called directly only if | |
| 64 the instance was instantiated without passing a host. | |
| 65 \end{funcdesc} | |
| 66 | |
| 67 \begin{funcdesc}{send}{data} | |
| 68 Send data to the server. This should be used directly only after the | |
| 69 \code{endheaders()} method has been called and before | |
| 70 \code{getreply()} has been called. | |
| 71 \end{funcdesc} | |
| 72 | |
| 73 \begin{funcdesc}{putrequest}{request\, selector} | |
| 74 This should be the first call after the connection to the server has | |
| 75 been made. It sends a line to the server consisting of the | |
| 76 \var{request} string, the \var{selector} string, and the HTTP version | |
| 77 (\code{HTTP/1.0}). | |
| 78 \end{funcdesc} | |
| 79 | |
| 80 \begin{funcdesc}{putheader}{header\, argument\optional{\, ...}} | |
| 81 Send an RFC-822 style header to the server. It sends a line to the | |
| 82 server consisting of the header, a colon and a space, and the first | |
| 83 argument. If more arguments are given, continuation lines are sent, | |
| 84 each consisting of a tab and an argument. | |
| 85 \end{funcdesc} | |
| 86 | |
| 87 \begin{funcdesc}{endheaders}{} | |
| 88 Send a blank line to the server, signalling the end of the headers. | |
| 89 \end{funcdesc} | |
| 90 | |
| 91 \begin{funcdesc}{getreply}{} | |
| 92 Complete the request by shutting down the sending end of the socket, | |
| 93 read the reply from the server, and return a triple (\var{replycode}, | |
| 94 \var{message}, \var{headers}). Here \var{replycode} is the integer | |
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95 reply code from the request (e.g.\ \code{200} if the request was |
| 2449 | 96 handled properly); \var{message} is the message string corresponding |
| 97 to the reply code; and \var{header} is an instance of the class | |
| 98 \code{rfc822.Message} containing the headers received from the server. | |
| 99 See the description of the \code{rfc822} module. | |
| 100 \stmodindex{rfc822} | |
| 101 \end{funcdesc} | |
| 102 | |
| 103 \begin{funcdesc}{getfile}{} | |
| 104 Return a file object from which the data returned by the server can be | |
| 105 read, using the \code{read()}, \code{readline()} or \code{readlines()} | |
| 106 methods. | |
| 107 \end{funcdesc} | |
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108 |
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109 \subsection{Example} |
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110 \nodename{HTTP Example} |
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111 |
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112 Here is an example session: |
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113 |
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114 \begin{verbatim} |
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115 >>> import httplib |
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116 >>> h = httplib.HTTP('www.cwi.nl') |
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117 >>> h.putrequest('GET', '/index.html') |
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118 >>> h.putheader('Accept', 'text/html') |
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119 >>> h.putheader('Accept', 'text/plain') |
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120 >>> h.endheaders() |
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121 >>> errcode, errmsg, headers = h.getreply() |
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122 >>> print errcode # Should be 200 |
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123 >>> f = h.getfile() |
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124 >>> data f.read() # Get the raw HTML |
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125 >>> f.close() |
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126 >>> |
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127 \end{verbatim} |