Unable to access unsecured https with selenium using browsermob proxy
Try use this
self.capabilities['acceptSslCerts'] = True
You can also call create_proxy with trustAllServers as argument:
self.proxy = self.server.create_proxy(params={'trustAllServers':'true'})
I faced the same problem for SSL proxying using BrowserMob Proxy. For this you have to install a certificate in your browser that has been defined in this link
Go to the bottom of the document, and you will see a section called "SSL support". Install the ca-certificate-rsa.cer in your browser and there would be no issue in SSL proxying anymore.