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Sometimes, library users cannot return a HTTP response as soon as the
request is received, or the operations that are required to generate it
can take a long time.
In order to solve this, libweb adds a new member to struct
http_response, namely step, which must be assigned to a function
whenever a HTTP response should be generated in a non-blocking manner.
Leaving the function pointer as null will fall back to the default
behaviour.
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A malicious user could inject an infinite number of empty files or
key/value pairs into a request in order to exhaust the device's
resources.
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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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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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