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Notes:
- Since curl would use the "Expect: 100-continue" header field for PUT
operations, this was a good operation to fix the existing issues in its
implementation.
Breaking changes:
- expect_continue is no longer exclusive to struct http_post. Now, it
has been moved into struct http_payload and it is up to users to check
it.
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Some applications might set up a struct handler object to listen on any
port i.e., 0, but still need a way to determine which port number was
eventually selected by the implementation.
Therefore, handler_listen has been reduced to the server initialization
bit, whereas the main loop has been split into its own function, namely
handler_loop.
Because of these changes, it no longer made sense for libweb to write
the selected port to standard output, as this is something now
applications can do on their own.
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Even if libweb already parses some common headers, such as
Content-Length, some users might find it interesting to inspect which
headers were received from a request.
Since HTTP/1.1 does not define a limit on the number of maximum headers
a client can send, for security reasons a maximum value must be provided
by the user. Any extra headers shall be then discarded by libweb.
An example application showing this new feature is also provided.
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So far, it was not possible callers to distinguish between decoding
errors, as caused by ill-formed input, from fatal errors.
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It was found out there was another project of the same name around
(https://git.sr.ht/~strahinja/slweb/), also related to website
generation.
In order to avoid confusion, a new name has been chosen for this
project. Surprisingly, libweb was not in use by any distributions
(according to https://repology.org and AUR index), and it should
reflect well the intention behind this project i.e., being a library
to build web-related stuff.
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This shall be replaced with more meaningful man pages for all functions
in slweb.
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application/x-www-form-urlencoded-data is (or should be) always text, so
it is preferrable to define struct http_post member "data" as a null-
terminated string.
For applications already making this assumption, this change should now
remove the need for string duplication.
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Whereas slcl, the project where slweb started, ignored this field, some
applications might require it.
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Now, slweb accepts requests such as:
--boundary
Content-Disposition: form-data; name="field1"
value1
--boundary
Content-Disposition: form-data; name="field2"
value2
--boundary
Content-Disposition: form-data; name="field3"; filename="example.txt"
The following breaking changes have been introduced:
Member "dir" from struct http_post was a leftover from the days where
slcl and slweb were one project. It did not make sense for slweb, since
it should not decide which Content-Disposition names are allowed. In
other words, "dir" was only relevant in the scope of slcl.
Member "n" from struct http_post used to have two meanings:
- The length of a URL-encoded request.
- The number of files on a multipart/form-data request.
Since "npairs" had to be introduced to struct http_post, it did not make
sense to keep this dual meaning any more. Therefore, "n" has been
restricted to the former, whereas a new member, called "nfiles", has
been introduced for the latter.
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Port numbers are unsigned by definition. Fortunately, this was a minor
issues since server_init was doing an implicit cast to unsigned short.
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Since slweb is meant as a library, it is advisable to keep public header
files under their own directory in order to avoid name clashing i.e.,
#include "something.h"
Now becomes:
#include "slweb/something.h"
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