302 redirect not being forwarded when websockets are enabled ------------------------------------------------------------ Key: MODCLUSTER-723 URL: https://issues.redhat.com/browse/MODCLUSTER-723 Project: mod_cluster Issue Type: Bug Components: Native (httpd modules) Affects Versions: 1.3.14.Final Reporter: Florian Morgan Assignee: Radoslav Husar Priority: Major I'm having an issue with mod_cluster with JBoss EWS and JBoss EAP. I have a JBoss EAP 7.1.6 server configured with JBoss EWS as a reverse proxy with mod_cluster. Normally everything works fine, I have no issue with this configuration.   When I add *WSUpgradeHeader NONE* I have a weird behaviour of EWS regarding the forwarding of HTTP redirects.   The normal behaviour is the following: # The client submit a request to this URL: [http://ews-host:8080/arche] # EWS forwards the request to JBoss EAP # EAP replies with a 302 redirect to [http://ews-host:8080/arche/|http://ews-host:8080/arche] (see the added */* at the end of the request)   # EWS forwards the 302 redirect to the client. # The client follows the redirect to [http://ews-host:8080/arche/|http://ews-host:8080/arche] # ... [The rest is fine and not significant to my problem] When I add *WSUpgradeHeader NONE* the EWS no longer forwards the 302 redirect from the EAP to the client, instead the redirect is *followed* by EWS to EAP and the redirected content is forwarded to the client: # The client submit a request to this URL: [http://ews-host:8080/arche] # EWS forwards the request to JBoss EAP # EAP replies with a 302 redirect to [http://ews-host:8080/arche/|http://ews-host:8080/arche] (see the added */* at the end of the request) # *(*) EWS follows the redirect and issue a request to JBoss EAP to [http://ews-host:8080/arche/|http://ews-host:8080/arche]* # *EAP replies with the content from /arche/* # *EWS replies the redirected content (from 5.) to the client.* (*) : I have no proof that EWS actually performs this request, maybe it comes from a cache. But I do this hypthesis to simplify the problem. I highlighted the changes in bold. The problem here is that the URL stays [http://ews-host:8080/arche] instead of being [http://ews-host:8080/arche/|http://ews-host:8080/arche]. It breaks all relative URLs from web pages.   Curiously, when the client issue 2 consecutive request, the first one follows the incorrect behaviour, but the second one behaves normally. It seems that EWS "remembers" the client host/ip and changes it behaviour to the correct behaviour when it sees it again. If I wait enough time, the incorrect behaviour is seen again. Finally when I issue the requests from the same host (client=ews-host), the incorrect behaviour is always seen. In that case EWS never forwards the redirect correctly. I tried to work around using a *Redirect "/arche" "/arche/"* configuration, but it doesn't change anything. I can provide cURL commands to reproduce the problem if needed. Do you know how can I have the correct behavour every time? Thanks for the help. PS : It seems to be linked to this issue https://issues.redhat.com/browse/MODCLUSTER-722 but the case is not identical. Maybe the cause of the problem is the same.