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In HTTP proxying, we can (and do) send the username and password immediately in the form of HTTP Basic, if we have them in the Conf. But if they get rejected, or if we never sent them in the first place and the server won't let us in without auth, then we get back an HTTP 407 response with a full set of headers and an error-document. Assuming the HTTP connection doesn't close after that (which in sensible HTTP/1.1 proxies it won't), this gives us the opportunity to respond by sending a second CONNECT request, containing a fresh username and password we just requested interactively from the user.
This is the README for PuTTY, a free Windows and Unix Telnet and SSH client. PuTTY is built using CMake <https://cmake.org/>. To compile in the simplest way (on any of Linux, Windows or Mac), run these commands in the source directory: cmake . cmake --build . Documentation (in various formats including Windows Help and Unix `man' pages) is built from the Halibut (`.but') files in the `doc' subdirectory using `doc/Makefile'. If you aren't using one of our source snapshots, you'll need to do this yourself. Halibut can be found at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>. The PuTTY home web site is https://www.chiark.greenend.org.uk/~sgtatham/putty/ If you want to send bug reports or feature requests, please read the Feedback section of the web site before doing so. Sending one-line reports saying `it doesn't work' will waste your time as much as ours. See the file LICENCE for the licence conditions.
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