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* fix(http): preserve user-supplied Host header when forwarding through a proxy (#10805) When sending a request through a proxy with the http adapter, axios was unconditionally rewriting `options.headers.host` to the request URL's hostname:port, overwriting any Host header the caller had set in `config.headers`. This made it impossible to direct a proxy to a virtual host that differs from the request URL — for example, hitting `127.0.0.1:4000` while asking the proxy to treat the request as `example.com`. Skip the default assignment when a Host header is already present (case-insensitive match, since users may pass `host`, `Host`, or `HOST`). * chore: apply some nitpicks --------- Co-authored-by: Jason Saayman <jasonsaayman@gmail.com>