diff options
Diffstat (limited to 'Lib/urllib/request.py')
| -rw-r--r-- | Lib/urllib/request.py | 90 |
1 files changed, 77 insertions, 13 deletions
diff --git a/Lib/urllib/request.py b/Lib/urllib/request.py index a46c689..b6690c3 100644 --- a/Lib/urllib/request.py +++ b/Lib/urllib/request.py @@ -134,13 +134,73 @@ __all__ = [ ] # used in User-Agent header sent -__version__ = sys.version[:3] +__version__ = '%d.%d' % sys.version_info[:2] _opener = None def urlopen(url, data=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT, *, cafile=None, capath=None, cadefault=False, context=None): + '''Open the URL url, which can be either a string or a Request object. + + *data* must be an object specifying additional data to be sent to + the server, or None if no such data is needed. See Request for + details. + + urllib.request module uses HTTP/1.1 and includes a "Connection:close" + header in its HTTP requests. + + The optional *timeout* parameter specifies a timeout in seconds for + blocking operations like the connection attempt (if not specified, the + global default timeout setting will be used). This only works for HTTP, + HTTPS and FTP connections. + + If *context* is specified, it must be a ssl.SSLContext instance describing + the various SSL options. See HTTPSConnection for more details. + + The optional *cafile* and *capath* parameters specify a set of trusted CA + certificates for HTTPS requests. cafile should point to a single file + containing a bundle of CA certificates, whereas capath should point to a + directory of hashed certificate files. More information can be found in + ssl.SSLContext.load_verify_locations(). + + The *cadefault* parameter is ignored. + + This function always returns an object which can work as a context + manager and has methods such as + + * geturl() - return the URL of the resource retrieved, commonly used to + determine if a redirect was followed + + * info() - return the meta-information of the page, such as headers, in the + form of an email.message_from_string() instance (see Quick Reference to + HTTP Headers) + + * getcode() - return the HTTP status code of the response. Raises URLError + on errors. + + For HTTP and HTTPS URLs, this function returns a http.client.HTTPResponse + object slightly modified. In addition to the three new methods above, the + msg attribute contains the same information as the reason attribute --- + the reason phrase returned by the server --- instead of the response + headers as it is specified in the documentation for HTTPResponse. + + For FTP, file, and data URLs and requests explicitly handled by legacy + URLopener and FancyURLopener classes, this function returns a + urllib.response.addinfourl object. + + Note that None may be returned if no handler handles the request (though + the default installed global OpenerDirector uses UnknownHandler to ensure + this never happens). + + In addition, if proxy settings are detected (for example, when a *_proxy + environment variable like http_proxy is set), ProxyHandler is default + installed and makes sure the requests are handled through the proxy. + + ''' global _opener if cafile or capath or cadefault: + import warnings + warnings.warn("cafile, cpath and cadefault are deprecated, use a " + "custom context instead.", DeprecationWarning, 2) if context is not None: raise ValueError( "You can't pass both context and any of cafile, capath, and " @@ -1170,6 +1230,11 @@ class AbstractHTTPHandler(BaseHandler): def set_http_debuglevel(self, level): self._debuglevel = level + def _get_content_length(self, request): + return http.client.HTTPConnection._get_content_length( + request.data, + request.get_method()) + def do_request_(self, request): host = request.host if not host: @@ -1178,24 +1243,22 @@ class AbstractHTTPHandler(BaseHandler): if request.data is not None: # POST data = request.data if isinstance(data, str): - msg = "POST data should be bytes or an iterable of bytes. " \ - "It cannot be of type str." + msg = "POST data should be bytes, an iterable of bytes, " \ + "or a file object. It cannot be of type str." raise TypeError(msg) if not request.has_header('Content-type'): request.add_unredirected_header( 'Content-type', 'application/x-www-form-urlencoded') - if not request.has_header('Content-length'): - try: - mv = memoryview(data) - except TypeError: - if isinstance(data, collections.Iterable): - raise ValueError("Content-Length should be specified " - "for iterable data of type %r %r" % (type(data), - data)) + if (not request.has_header('Content-length') + and not request.has_header('Transfer-encoding')): + content_length = self._get_content_length(request) + if content_length is not None: + request.add_unredirected_header( + 'Content-length', str(content_length)) else: request.add_unredirected_header( - 'Content-length', '%d' % (len(mv) * mv.itemsize)) + 'Transfer-encoding', 'chunked') sel_host = host if request.has_proxy(): @@ -1251,7 +1314,8 @@ class AbstractHTTPHandler(BaseHandler): try: try: - h.request(req.get_method(), req.selector, req.data, headers) + h.request(req.get_method(), req.selector, req.data, headers, + encode_chunked=req.has_header('Transfer-encoding')) except OSError as err: # timeout error raise URLError(err) r = h.getresponse() |