[ReverseProxyPlugin] `Misdirected Request (E2815)` while proxying to upstream https endpoint

[abhinavsingh]

Default plugin values work fine:

REVERSE_PROXY_PASS = [
    b'http://httpbin.org/get',
    b'https://httpbin.org/get',
]

But replacing the url with https://files.pythonhosted.org/packages/20/9a/e5d9ec41927401e41aea8af6d16e78b5e612bca4699d417f646a9610a076/Jinja2-3.0.3-py3-none-any.whl#sha256=077ce6014f7b40d03b47d1f1ca4b0fc8328a692bd284016f806ed0eaca390ad8 fails the curl invocation with Misdirected Request (E2815)

[abhinavsingh]

I think above example is bound to fail anyways. We shouldn't reverse proxy in the above fashion to begin with. As request packet dispatched to upstream contains Host header originally used by the client. By default, ReverseProxy sends request to upstream as-is, without any modifications.

Fix in #1046 is not correct either in that respect. We should not change the Host header field. In-fact, we can provide a ReverseProxyBasePlugin hook which allows developers to modify the request before dispatching to upstream server.