If multiple header fields with the same name occur, they are combined
according to the rules in RFC 2616 sec 4.2:
Appending each subsequent field-value to the first, each separated by
a comma. The order in which header fields with the same field-name are
received is significant to the interpretation of the combined field
value.
Section 19.6 of RFC 2616 (HTTP/1.1):
It is beyond the scope of a protocol specification to mandate
compliance with previous versions. HTTP/1.1 was deliberately
designed, however, to make supporting previous versions easy....
And we would expect HTTP/1.1 clients to:
- recognize the format of the Status-Line for HTTP/1.0 and 1.1
responses;
- understand any valid response in the format of HTTP/0.9, 1.0, or
1.1.
The changes to the code do handle response in the format of HTTP/0.9.
Some users may consider this a bug because all responses with a
sufficiently corrupted status line will look like an HTTP/0.9
response. These users can pass strict=1 to the HTTP constructors to
get a BadStatusLine exception instead.
While this is a new feature of sorts, it enhances the robustness of
the code (be tolerant in what you accept). Thus, I consider it a bug
fix candidate.
XXX strict needs to be documented.
[1.3] Added documentation of the namespace URI for elements with no namespace.
[1.4] New property http://www.python.org/sax/properties/encoding.
[1.5] Support optional string interning in pyexpat.
[1.15]
Added understanding of the feature_validation, feature_external_pes,
and feature_string_interning features.
Added support for the feature_external_ges feature.
Added support for the property_xml_string property.
[1.16]
Made it recognize the namespace prefixes feature.
[1.17]
removed erroneous first line
[1.19]
Support optional string interning in pyexpat.
[1.21]
Restore compatibility with versions of Python that did not support weak
references. These do not get the cyclic reference fix, but they will
continue to work as they did before.
[1.22]
Activate entity processing unless standalone.
Specifically,
decode_rfc2231(), encode_rfc2231(): Functions to encode and decode RFC
2231 style parameters.
decode_params(): Function to decode a list of parameters.
Specifically,
_formatparam(): Teach this about encoded `param' arguments, which are
a 3-tuple of items (charset, language, value). language is ignored.
_unquotevalue(): Handle both 3-tuple RFC 2231 values and unencoded
values.
_get_params_preserve(): Decode the parameters before returning them.
get_params(), get_param(): Use _unquotevalue().
get_filename(), get_boundary(): Teach these about encoded (3-tuple)
parameters.
folding. Note that some of the Japanese tests have changed, but I
don't really know if they are correct or not. :(
Someone with Japanese and RFC 2047 expertise, please take a look!
headers with no charset or 'us-ascii' charsets. Actually this is only
partially true: we know about semicolons (but not true parameters) and
we know about whitespace (but not technically folding whitespace).
Still it should be good enough for all practical purposes.
Other changes include:
__init__(): Add a continuation_ws argument, which defaults to a single
space. Set this to change the whitespace used for continuation lines
when a header must be split. Also, changed the way header line
lengths are calculated, so that they take into account continuation_ws
(when tabs-expanded) and any provided header_name parameter. This
should do much better on returning split headers for which the first
and subsequent lines must fit into a specified width.
guess_maxlinelen(): Removed. I don't think we need this method as
part of the public API.
encode_chunks() -> _encode_chunks(): I don't think we need this one as
part of the public API either.
know anything about RFC 2047 encoded headers. Fortunately we have a
perfectly good header splitter in Header.encode(). So we just call
that to give us a properly formatted and split header.
Header.encode() didn't know about "highest-level syntactic breaks" but
that's been fixed now too.
Didn't use the patch, because universal newlines support made it easy.
It might be worth fixing the actual problem in the 2.2 maintenance
branch, in which case the patch is still needed.
Setting the buffer_text attribute to true causes the parser to collect
character data, waiting as long as possible to report it to the Python
callback. This can save an enormous number of callbacks from C to
Python, which can be a substantial performance improvement.
buffer_text defaults to false.
The HTTPResponse class now handles 100 continue responses, instead of
choking on them. It detects them internally in the _begin() method
and ignores them. Based on a patch by Bob Kline.
This closes SF bugs 498149 and 551273.
The FakeSocket class (for SSL) is now usable with HTTP/1.1
connections. The old version of the code could not work with
persistent connections, because the makefile() implementation read
until EOF before returning. If the connection is persistent, the
server sends a response and leaves the connection open. A client that
reads until EOF will block until the server gives up on the connection
-- more than a minute in my test case.
The problem was fixed by implementing a reasonable makefile(). It
reads data only when it is needed by the layers above it. It's
implementation uses an internal buffer with a default size of 8192.
Also, rename begin() method of HTTPResponse to _begin() because it
should only be called by the HTTPConnection.
Fred Drake
Jack Jansen
Jeremy Hylton
Kurt B. Kaiser
unknown
Tim Peters
Greg Ward
Barry Warsaw
Martin v. Löwis
Raymond Hettinger
Fredrik Lundh
Neal Norwitz