Server-side replay lets us replay server responses from a saved HTTP
conversation.

Matching requests with responses
--------------------------------

By default, the __mitm*__ tools match incoming requests with responses from the
save file based on all request parameters, except the request headers. This
works in most circumstances, and makes it possible to replay server responses
in situations where request headers would naturally vary, e.g. using a
different user agent. The __--rheader__ option to both __mitmproxy__ and
__mitmdump__ allows you to specify individual headers that should be included
in the matching process.


Response refreshing
-------------------

Simply replaying server responses without modification will often result in
unexpected behaviour. For example cookie timeouts that were in the future at
the time a conversation was recorded might be in the past at the time it is
replayed. By default, the __mitm*__ tools refresh server responses before
sending them to the client. The __date__, __expires__ and __last-modified__
headers are all updated to have the same relative time offset as they had at
the time of recording. So, if they were in the past at the time of recording,
they will be in the past at the time of replay, and vice versa. Cookie expiry
times are updated in a similar way.

You can turn off response refreshing using the __norefresh__ option, available
both on the command-line and using the "options" keyboard shortcut within
__mitmproxy__.