Re: HTTP 401: Apache strips out response headers (Apache Users)

Marco I think I am experiencing this too.

I am using apache to reverse proxy to our app that handles the web sockets / chat.

As far as I can tell from mod_dumpio's logging apache returns the correct response headers to the client - particularly:

[Wed Jan 11 09:31:43.807204 2017] [dumpio:trace7] [pid 8091] mod_dumpio.c(100): [remote 192.168.1.136:8001] mod_dumpio: dumpio_in (data-HEAP): HTTP/1.1 101 Switching Protocols\r\nServer: AutobahnPython/0.17.1\r\nUpgrade: WebSocket\r\nConnection: Upgrade\r\nSec-WebSocket-Accept: 9+mE2HjR58djdFt7E0WxNbqemsM=\r\n\r\n\x81\x10{"accept": true}

[Wed Jan 11 09:31:43.807235 2017] [dumpio:trace7] [pid 8091] mod_dumpio.c(100): [client 127.0.0.1:51749] mod_dumpio: dumpio_out (data-TRANSIENT): HTTP/1.1 101 Switching Protocols\r\nServer: AutobahnPython/0.17.1\r\nUpgrade: WebSocket\r\nConnection: Upgrade\r\nSec-WebSocket-Accept: 9+mE2HjR58djdFt7E0WxNbqemsM=\r\n\r\n\x81\x10{"accept": true}

However according to Firefox, Safari & Chrome those headers aren't there:

"Error during WebSocket handshake: 'Upgrade' header is missing"

I'm looking forward to getting to the bottom of this

2017-01-10 17:57 GMT-03:00 Marco Pizzoli <marco.pizzoli@xxxxxxxxx>:

Hi all,
I am reverse proxying a backend which returns a http code 401.
I see Apache is stripping out all the http headers returned by the backend along with the 401 and this is causing trouble to the client application.

Is there a way to get the original http headers to the client?

I can't find any documentation about this. Not even a reference to the fact Apache is re-writing the answer, but I checked myself and now I am sure of this behaviour....

Apache currently used for this setup is 2.2. Migration to 2.4 is planned in the coming motnhs.

Thank you in advance for your help
Marco