add direct http proxy support #635
Merged
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There are at least two types of proxies we should support, relaying and MITM (I don't know what it's actually supposed to be called).
This adds support for MITM, which means that our HTTP client does a normal HTTP request to the proxy server, but the request path is the full URL. The upstream proxy then issues its own HTTP request to the destination. The benefit of this approach is that the proxy can easily modify the request/response, which is the behavior I currently need.