Mercurial > cpython-lru_cache-weakref
annotate Lib/BaseHTTPServer.py @ 25838:8540887bcec6 2.2
Backport of 2.183:
Fix memory leak in add_subclass() found by NealN with valgrind.
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Fri, 18 Oct 2002 13:42:21 +0000 |
| parents | f8a9db67fa5b |
| children | 27f36f4bf525 |
| rev | line source |
|---|---|
| 2887 | 1 """HTTP server base class. |
| 2 | |
| 3 Note: the class in this module doesn't implement any HTTP request; see | |
| 4 SimpleHTTPServer for simple implementations of GET, HEAD and POST | |
| 5 (including CGI scripts). | |
| 6 | |
| 7 Contents: | |
| 8 | |
| 9 - BaseHTTPRequestHandler: HTTP request handler base class | |
| 10 - test: test function | |
| 11 | |
| 12 XXX To do: | |
| 13 | |
| 14 - send server version | |
| 15 - log requests even later (to capture byte count) | |
| 16 - log user-agent header and other interesting goodies | |
| 17 - send error log to separate file | |
| 18 - are request names really case sensitive? | |
| 19 | |
| 20 """ | |
| 21 | |
| 22 | |
| 23 # See also: | |
| 24 # | |
| 25 # HTTP Working Group T. Berners-Lee | |
| 26 # INTERNET-DRAFT R. T. Fielding | |
| 27 # <draft-ietf-http-v10-spec-00.txt> H. Frystyk Nielsen | |
| 28 # Expires September 8, 1995 March 8, 1995 | |
| 29 # | |
| 30 # URL: http://www.ics.uci.edu/pub/ietf/http/draft-ietf-http-v10-spec-00.txt | |
| 31 | |
| 32 | |
| 33 # Log files | |
| 34 # --------- | |
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35 # |
| 2887 | 36 # Here's a quote from the NCSA httpd docs about log file format. |
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37 # |
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38 # | The logfile format is as follows. Each line consists of: |
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39 # | |
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40 # | host rfc931 authuser [DD/Mon/YYYY:hh:mm:ss] "request" ddd bbbb |
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41 # | |
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42 # | host: Either the DNS name or the IP number of the remote client |
| 2887 | 43 # | rfc931: Any information returned by identd for this person, |
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44 # | - otherwise. |
| 2887 | 45 # | authuser: If user sent a userid for authentication, the user name, |
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46 # | - otherwise. |
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47 # | DD: Day |
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48 # | Mon: Month (calendar name) |
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49 # | YYYY: Year |
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50 # | hh: hour (24-hour format, the machine's timezone) |
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51 # | mm: minutes |
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52 # | ss: seconds |
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53 # | request: The first line of the HTTP request as sent by the client. |
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54 # | ddd: the status code returned by the server, - if not available. |
| 2887 | 55 # | bbbb: the total number of bytes sent, |
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56 # | *not including the HTTP/1.0 header*, - if not available |
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57 # | |
| 2887 | 58 # | You can determine the name of the file accessed through request. |
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59 # |
| 2887 | 60 # (Actually, the latter is only true if you know the server configuration |
| 61 # at the time the request was made!) | |
| 62 | |
| 63 | |
| 64 __version__ = "0.2" | |
| 65 | |
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66 __all__ = ["HTTPServer", "BaseHTTPRequestHandler"] |
| 2887 | 67 |
| 68 import sys | |
| 69 import time | |
| 70 import socket # For gethostbyaddr() | |
| 71 import mimetools | |
| 72 import SocketServer | |
| 73 | |
| 74 # Default error message | |
| 75 DEFAULT_ERROR_MESSAGE = """\ | |
| 76 <head> | |
| 77 <title>Error response</title> | |
| 78 </head> | |
| 79 <body> | |
| 80 <h1>Error response</h1> | |
| 81 <p>Error code %(code)d. | |
| 82 <p>Message: %(message)s. | |
| 83 <p>Error code explanation: %(code)s = %(explain)s. | |
| 84 </body> | |
| 85 """ | |
| 86 | |
| 87 | |
| 88 class HTTPServer(SocketServer.TCPServer): | |
| 89 | |
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90 allow_reuse_address = 1 # Seems to make sense in testing environment |
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91 |
| 2887 | 92 def server_bind(self): |
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93 """Override server_bind to store the server name.""" |
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94 SocketServer.TCPServer.server_bind(self) |
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95 host, port = self.socket.getsockname() |
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96 self.server_name = socket.getfqdn(host) |
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97 self.server_port = port |
| 2887 | 98 |
| 99 | |
| 100 class BaseHTTPRequestHandler(SocketServer.StreamRequestHandler): | |
| 101 | |
| 102 """HTTP request handler base class. | |
| 103 | |
| 104 The following explanation of HTTP serves to guide you through the | |
| 105 code as well as to expose any misunderstandings I may have about | |
| 106 HTTP (so you don't need to read the code to figure out I'm wrong | |
| 107 :-). | |
| 108 | |
| 109 HTTP (HyperText Transfer Protocol) is an extensible protocol on | |
| 110 top of a reliable stream transport (e.g. TCP/IP). The protocol | |
| 111 recognizes three parts to a request: | |
| 112 | |
| 113 1. One line identifying the request type and path | |
| 114 2. An optional set of RFC-822-style headers | |
| 115 3. An optional data part | |
| 116 | |
| 117 The headers and data are separated by a blank line. | |
| 118 | |
| 119 The first line of the request has the form | |
| 120 | |
| 121 <command> <path> <version> | |
| 122 | |
| 123 where <command> is a (case-sensitive) keyword such as GET or POST, | |
| 124 <path> is a string containing path information for the request, | |
| 125 and <version> should be the string "HTTP/1.0". <path> is encoded | |
| 126 using the URL encoding scheme (using %xx to signify the ASCII | |
| 127 character with hex code xx). | |
| 128 | |
| 129 The protocol is vague about whether lines are separated by LF | |
| 130 characters or by CRLF pairs -- for compatibility with the widest | |
| 131 range of clients, both should be accepted. Similarly, whitespace | |
| 132 in the request line should be treated sensibly (allowing multiple | |
| 133 spaces between components and allowing trailing whitespace). | |
| 134 | |
| 135 Similarly, for output, lines ought to be separated by CRLF pairs | |
| 136 but most clients grok LF characters just fine. | |
| 137 | |
| 138 If the first line of the request has the form | |
| 139 | |
| 140 <command> <path> | |
| 141 | |
| 142 (i.e. <version> is left out) then this is assumed to be an HTTP | |
| 143 0.9 request; this form has no optional headers and data part and | |
| 144 the reply consists of just the data. | |
| 145 | |
| 146 The reply form of the HTTP 1.0 protocol again has three parts: | |
| 147 | |
| 148 1. One line giving the response code | |
| 149 2. An optional set of RFC-822-style headers | |
| 150 3. The data | |
| 151 | |
| 152 Again, the headers and data are separated by a blank line. | |
| 153 | |
| 154 The response code line has the form | |
| 155 | |
| 156 <version> <responsecode> <responsestring> | |
| 157 | |
| 158 where <version> is the protocol version (always "HTTP/1.0"), | |
| 159 <responsecode> is a 3-digit response code indicating success or | |
| 160 failure of the request, and <responsestring> is an optional | |
| 161 human-readable string explaining what the response code means. | |
| 162 | |
| 163 This server parses the request and the headers, and then calls a | |
| 164 function specific to the request type (<command>). Specifically, | |
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165 a request SPAM will be handled by a method do_SPAM(). If no |
| 2887 | 166 such method exists the server sends an error response to the |
| 167 client. If it exists, it is called with no arguments: | |
| 168 | |
| 169 do_SPAM() | |
| 170 | |
| 171 Note that the request name is case sensitive (i.e. SPAM and spam | |
| 172 are different requests). | |
| 173 | |
| 174 The various request details are stored in instance variables: | |
| 175 | |
| 176 - client_address is the client IP address in the form (host, | |
| 177 port); | |
| 178 | |
| 179 - command, path and version are the broken-down request line; | |
| 180 | |
| 181 - headers is an instance of mimetools.Message (or a derived | |
| 182 class) containing the header information; | |
| 183 | |
| 184 - rfile is a file object open for reading positioned at the | |
| 185 start of the optional input data part; | |
| 186 | |
| 187 - wfile is a file object open for writing. | |
| 188 | |
| 189 IT IS IMPORTANT TO ADHERE TO THE PROTOCOL FOR WRITING! | |
| 190 | |
| 191 The first thing to be written must be the response line. Then | |
| 192 follow 0 or more header lines, then a blank line, and then the | |
| 193 actual data (if any). The meaning of the header lines depends on | |
| 194 the command executed by the server; in most cases, when data is | |
| 195 returned, there should be at least one header line of the form | |
| 196 | |
| 197 Content-type: <type>/<subtype> | |
| 198 | |
| 199 where <type> and <subtype> should be registered MIME types, | |
| 200 e.g. "text/html" or "text/plain". | |
| 201 | |
| 202 """ | |
| 203 | |
| 204 # The Python system version, truncated to its first component. | |
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205 sys_version = "Python/" + sys.version.split()[0] |
| 2887 | 206 |
| 207 # The server software version. You may want to override this. | |
| 208 # The format is multiple whitespace-separated strings, | |
| 209 # where each string is of the form name[/version]. | |
| 210 server_version = "BaseHTTP/" + __version__ | |
| 211 | |
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212 def parse_request(self): |
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213 """Parse a request (internal). |
| 2887 | 214 |
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215 The request should be stored in self.raw_request; the results |
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216 are in self.command, self.path, self.request_version and |
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217 self.headers. |
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218 |
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219 Return value is 1 for success, 0 for failure; on failure, an |
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220 error is sent back. |
| 2887 | 221 |
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222 """ |
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223 self.request_version = version = "HTTP/0.9" # Default |
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224 requestline = self.raw_requestline |
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225 if requestline[-2:] == '\r\n': |
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226 requestline = requestline[:-2] |
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227 elif requestline[-1:] == '\n': |
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228 requestline = requestline[:-1] |
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229 self.requestline = requestline |
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230 words = requestline.split() |
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231 if len(words) == 3: |
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232 [command, path, version] = words |
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233 if version[:5] != 'HTTP/': |
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234 self.send_error(400, "Bad request version (%s)" % `version`) |
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235 return 0 |
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236 elif len(words) == 2: |
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237 [command, path] = words |
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238 if command != 'GET': |
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239 self.send_error(400, |
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240 "Bad HTTP/0.9 request type (%s)" % `command`) |
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241 return 0 |
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242 else: |
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243 self.send_error(400, "Bad request syntax (%s)" % `requestline`) |
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244 return 0 |
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245 self.command, self.path, self.request_version = command, path, version |
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246 self.headers = self.MessageClass(self.rfile, 0) |
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247 return 1 |
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248 |
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249 def handle(self): |
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250 """Handle a single HTTP request. |
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251 |
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252 You normally don't need to override this method; see the class |
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253 __doc__ string for information on how to handle specific HTTP |
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254 commands such as GET and POST. |
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255 |
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256 """ |
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257 |
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258 self.raw_requestline = self.rfile.readline() |
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259 if not self.parse_request(): # An error code has been sent, just exit |
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260 return |
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261 mname = 'do_' + self.command |
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262 if not hasattr(self, mname): |
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263 self.send_error(501, "Unsupported method (%s)" % `self.command`) |
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264 return |
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265 method = getattr(self, mname) |
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266 method() |
| 2887 | 267 |
| 268 def send_error(self, code, message=None): | |
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269 """Send and log an error reply. |
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271 Arguments are the error code, and a detailed message. |
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272 The detailed message defaults to the short entry matching the |
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273 response code. |
| 2887 | 274 |
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275 This sends an error response (so it must be called before any |
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276 output has been generated), logs the error, and finally sends |
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277 a piece of HTML explaining the error to the user. |
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279 """ |
| 2887 | 280 |
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281 try: |
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282 short, long = self.responses[code] |
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283 except KeyError: |
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284 short, long = '???', '???' |
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285 if not message: |
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286 message = short |
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287 explain = long |
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288 self.log_error("code %d, message %s", code, message) |
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289 self.send_response(code, message) |
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290 self.send_header("Content-Type", "text/html") |
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291 self.end_headers() |
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292 self.wfile.write(self.error_message_format % |
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293 {'code': code, |
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294 'message': message, |
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295 'explain': explain}) |
| 2887 | 296 |
| 297 error_message_format = DEFAULT_ERROR_MESSAGE | |
| 298 | |
| 299 def send_response(self, code, message=None): | |
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300 """Send the response header and log the response code. |
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302 Also send two standard headers with the server software |
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303 version and the current date. |
| 2887 | 304 |
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305 """ |
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306 self.log_request(code) |
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307 if message is None: |
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308 if self.responses.has_key(code): |
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309 message = self.responses[code][0] |
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310 else: |
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311 message = '' |
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312 if self.request_version != 'HTTP/0.9': |
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313 self.wfile.write("%s %s %s\r\n" % |
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314 (self.protocol_version, str(code), message)) |
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315 self.send_header('Server', self.version_string()) |
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316 self.send_header('Date', self.date_time_string()) |
| 2887 | 317 |
| 318 def send_header(self, keyword, value): | |
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319 """Send a MIME header.""" |
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320 if self.request_version != 'HTTP/0.9': |
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321 self.wfile.write("%s: %s\r\n" % (keyword, value)) |
| 2887 | 322 |
| 323 def end_headers(self): | |
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324 """Send the blank line ending the MIME headers.""" |
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325 if self.request_version != 'HTTP/0.9': |
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326 self.wfile.write("\r\n") |
| 2887 | 327 |
| 328 def log_request(self, code='-', size='-'): | |
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329 """Log an accepted request. |
| 2887 | 330 |
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331 This is called by send_reponse(). |
| 2887 | 332 |
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333 """ |
| 2887 | 334 |
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335 self.log_message('"%s" %s %s', |
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336 self.requestline, str(code), str(size)) |
| 2887 | 337 |
| 338 def log_error(self, *args): | |
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339 """Log an error. |
| 2887 | 340 |
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341 This is called when a request cannot be fulfilled. By |
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342 default it passes the message on to log_message(). |
| 2887 | 343 |
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344 Arguments are the same as for log_message(). |
| 2887 | 345 |
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346 XXX This should go to the separate error log. |
| 2887 | 347 |
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348 """ |
| 2887 | 349 |
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350 apply(self.log_message, args) |
| 2887 | 351 |
| 352 def log_message(self, format, *args): | |
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353 """Log an arbitrary message. |
| 2887 | 354 |
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355 This is used by all other logging functions. Override |
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356 it if you have specific logging wishes. |
| 2887 | 357 |
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358 The first argument, FORMAT, is a format string for the |
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359 message to be logged. If the format string contains |
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360 any % escapes requiring parameters, they should be |
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361 specified as subsequent arguments (it's just like |
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362 printf!). |
| 2887 | 363 |
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364 The client host and current date/time are prefixed to |
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365 every message. |
| 2887 | 366 |
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367 """ |
| 2887 | 368 |
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369 sys.stderr.write("%s - - [%s] %s\n" % |
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370 (self.address_string(), |
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371 self.log_date_time_string(), |
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372 format%args)) |
| 2887 | 373 |
| 374 def version_string(self): | |
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375 """Return the server software version string.""" |
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376 return self.server_version + ' ' + self.sys_version |
| 2887 | 377 |
| 378 def date_time_string(self): | |
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379 """Return the current date and time formatted for a message header.""" |
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380 now = time.time() |
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381 year, month, day, hh, mm, ss, wd, y, z = time.gmtime(now) |
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382 s = "%s, %02d %3s %4d %02d:%02d:%02d GMT" % ( |
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383 self.weekdayname[wd], |
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384 day, self.monthname[month], year, |
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385 hh, mm, ss) |
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386 return s |
| 2887 | 387 |
| 388 def log_date_time_string(self): | |
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389 """Return the current time formatted for logging.""" |
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390 now = time.time() |
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391 year, month, day, hh, mm, ss, x, y, z = time.localtime(now) |
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392 s = "%02d/%3s/%04d %02d:%02d:%02d" % ( |
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393 day, self.monthname[month], year, hh, mm, ss) |
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394 return s |
| 2887 | 395 |
| 396 weekdayname = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'] | |
| 397 | |
| 398 monthname = [None, | |
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399 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', |
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400 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'] |
| 2887 | 401 |
| 402 def address_string(self): | |
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403 """Return the client address formatted for logging. |
| 2887 | 404 |
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405 This version looks up the full hostname using gethostbyaddr(), |
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406 and tries to find a name that contains at least one dot. |
| 2887 | 407 |
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408 """ |
| 2887 | 409 |
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410 host, port = self.client_address |
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411 return socket.getfqdn(host) |
| 2887 | 412 |
| 413 # Essentially static class variables | |
| 414 | |
| 415 # The version of the HTTP protocol we support. | |
| 416 # Don't override unless you know what you're doing (hint: incoming | |
| 417 # requests are required to have exactly this version string). | |
| 418 protocol_version = "HTTP/1.0" | |
| 419 | |
| 420 # The Message-like class used to parse headers | |
| 421 MessageClass = mimetools.Message | |
| 422 | |
| 423 # Table mapping response codes to messages; entries have the | |
| 424 # form {code: (shortmessage, longmessage)}. | |
| 425 # See http://www.w3.org/hypertext/WWW/Protocols/HTTP/HTRESP.html | |
| 426 responses = { | |
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427 200: ('OK', 'Request fulfilled, document follows'), |
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428 201: ('Created', 'Document created, URL follows'), |
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429 202: ('Accepted', |
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430 'Request accepted, processing continues off-line'), |
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431 203: ('Partial information', 'Request fulfilled from cache'), |
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432 204: ('No response', 'Request fulfilled, nothing follows'), |
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433 |
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434 301: ('Moved', 'Object moved permanently -- see URI list'), |
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435 302: ('Found', 'Object moved temporarily -- see URI list'), |
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436 303: ('Method', 'Object moved -- see Method and URL list'), |
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437 304: ('Not modified', |
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438 'Document has not changed singe given time'), |
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439 |
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440 400: ('Bad request', |
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441 'Bad request syntax or unsupported method'), |
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442 401: ('Unauthorized', |
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443 'No permission -- see authorization schemes'), |
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444 402: ('Payment required', |
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445 'No payment -- see charging schemes'), |
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446 403: ('Forbidden', |
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447 'Request forbidden -- authorization will not help'), |
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448 404: ('Not found', 'Nothing matches the given URI'), |
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449 |
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450 500: ('Internal error', 'Server got itself in trouble'), |
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451 501: ('Not implemented', |
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452 'Server does not support this operation'), |
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453 502: ('Service temporarily overloaded', |
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454 'The server cannot process the request due to a high load'), |
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455 503: ('Gateway timeout', |
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456 'The gateway server did not receive a timely response'), |
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457 |
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458 } |
| 2887 | 459 |
| 460 | |
| 461 def test(HandlerClass = BaseHTTPRequestHandler, | |
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462 ServerClass = HTTPServer): |
| 2887 | 463 """Test the HTTP request handler class. |
| 464 | |
| 465 This runs an HTTP server on port 8000 (or the first command line | |
| 466 argument). | |
| 467 | |
| 468 """ | |
| 469 | |
| 470 if sys.argv[1:]: | |
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471 port = int(sys.argv[1]) |
| 2887 | 472 else: |
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473 port = 8000 |
| 2887 | 474 server_address = ('', port) |
| 475 | |
| 476 httpd = ServerClass(server_address, HandlerClass) | |
| 477 | |
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478 sa = httpd.socket.getsockname() |
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479 print "Serving HTTP on", sa[0], "port", sa[1], "..." |
| 2887 | 480 httpd.serve_forever() |
| 481 | |
| 482 | |
| 483 if __name__ == '__main__': | |
| 484 test() |