Suppose we have a real server A and a shadow server B, both of which are behind a mitmproxy instance that works in reverse mode. All the service requests are destined for server A through HTTPS originally.
Is it possible that, for each request destined for server A, we duplicate and replay that request to server B through an HTTPS connection simultaneously? Then the response from server A is redirected by mitmproxy to the original client; but the response from B will be dropped automatically. Here I want to do real-time replay which is different from other posts I have seen that record a log and then replay. Also, the mitmproxy needs to establish two https connections to A and B concurrently.
Please let me know if mitmproxy could do that using its scripting interface or how to extend it to achieve that.
Thanks. Actually I have noticed this script. However, it is replaying HTTP request. What if the proxy also talks to the shadow server B using HTTPS? Then the mitmproxy would also need to negotiate the TLS crypto parameters with B through the TLS handshake process. Will mitmproxy do TLS handshake with B automatically?
I have tested the dup_and_replay script for mitmproxy version 2.0.0. However, I encountered a couple of problems.
Problem#1: This line of script “ctx.master.view.add(f)” leads to an error message:
“AttributeError: ‘DumpMaster’ object has no attributed ‘view’”
Problem#2: then I go ahead and comment out the line mentioned in Problem#1, but the main mitmproxy thread got stuck when setting “block” to be True in the ‘replay_request’ function. But if I set ‘block’ to false, then I can see that the request is constantly replayed and response is received.