Here is the pcap (the request starts line 35)
http://dl.free.fr/getfile.pl?file=/EE6PncFm
Sorry about the page in french, you can click on “Valider et télécharger le fichier” to get the pcap
Here is the interesting part as an image :
My Client is 10.7.0.214/127.0.0.1 and 10.7.0.225 is the VM hosting mitmproxy
It seems that the part that is not working properly is at line 135