The headers set with --http-headers are documented for passing
credentials such as Authorization or Cookie. The backend used the
default net/http redirect policy which copies all but a handful of
well known headers to any redirect target, so a redirect from the
configured server to another host would send those credentials to
that host, and a redirect from https to http would send them in
plaintext.
When headers are configured this installs a CheckRedirect function
which:
- removes the configured headers from every hop once the redirect
chain has left the originally requested host
- refuses a redirect from https to http with an error
Nick Craig-Wood
aef94cd0e7