MitmProxy cannot start in Ubuntu: Error starting proxy server: error(98, 'Address already in use')

Question

I am willing to use MitmProxy to intercept https traffic in my computer. I followed the installation document here in Ubuntu. After complete, I try to run "mitmproxy" in Terminal and got this error.

Error starting proxy server: error(98, 'Address already in use')

I tried to check if some process is using port 80 but not found.

Answer 1

mitmproxy的默认端口为8080，因此看起来您已经在8080端口上运行了一个应用程序。