Transparent proxy support for upstream proxies

Is the following setup possible?

Client <-> Transparent mimtproxy <-> Other upsteam proxies <-> HTTP/HTTPS Website

When I launch mitmproxy in transparent mode, both HTTP and HTTPS traffic is captured perfectly. However, when I try to use another http proxy from the client application, mitmproxy fails. This happens both when the final site is http and when it’s https:

HttpError('Invalid HTTP request form (expected: relative, got: absolute)',)

Is this supported or am I doing something wrong?

[a-goryachev]

+1 Complex ‘transparent+upstream’ mode out of the box could be very useful. Especially if you want to redirect request to different regular proxy servers if HTTP header match condition.

[loxK]

I need it! Any alternative ?

I need

Local App <-> IPTABLES REDIRECT <-> mimtproxy on a different host, non-transparent mode <-> HTTP/HTTPS Website

I tried using IP tables DNAT to redirect request to the mitmproxy on remote host and I get “HttpError(‘Invalid HTTP request form (expected: absolute, got: relative)’,)”

I tried using IP tables REDIRECT to a local mitmproxy in upstream mode to the remote mitmproxy and I get the same error …

Any workaround ?