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• Different result with reverse proxy apache and lighttpd.

  - by Danny

  I have an Apache server running in reverse proxy mode in front of a Tomcat java server. It handle HTTP and HTTPS and send those request back and forth to the Tomcat server on an internal HTTP port. I'm trying to replace the reverse proxy with Lighttpd. Here's the problem: while asking for the same HTTPS url, while using Apache as the reverse proxy, the Tomcat server redirect (302) to an HTTPS page but with Lighttpd it redirect to the same page in HTTP (not HTTPS). What does Lighttpd could do different in order to have a different result from the backend server? In theory, using Apache or Lighttpd server as a reverse proxy should not change anything... but it does. Any idea? I'll try to find something by sniffing the traffic on the backend tomcat server.

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• filter to reverse lines of a text file

  - by Greg Hewgill

  I'm writing a small shell script that needs to reverse the lines of a text file. Is there a standard filter command to do this sort of thing? My specific application is that I'm getting a list of Git commit identifiers, and I want to process them in reverse order: git log --pretty=oneline work...master | grep -v DEBUG: | cut -d' ' -f1 | reverse The best I've come up with is to implement reverse like this: ... | cat -b | sort -rn | cut -f2- This uses cat to number every line, then sort to sort them in descending numeric order (which ends up reversing the whole file), then cut to remove the unneeded line number. The above works for my application, but may fail in the general case because cat -b only numbers nonblank lines. Is there a better, more general way to do this?

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• Rails' page caching vs. HTTP reverse proxy caches

  - by John Topley

  I've been catching up with the Scaling Rails screencasts. In episode 11 which covers advanced HTTP caching (using reverse proxy caches such as Varnish and Squid etc.), they recommend only considering using a reverse proxy cache once you've already exhausted the possibilities of page, action and fragment caching within your Rails application (as well as memcached etc. but that's not relevant to this question). What I can't quite understand is how using an HTTP reverse proxy cache can provide a performance boost for an application that already uses page caching. To simplify matters, let's assume that I'm talking about a single host here. This is my understanding of how both techniques work (maybe I'm wrong): With page caching the Rails process is hit initially and then generates a static HTML file that is served directly by the Web server for subsequent requests, for as long as the cache for that request is valid. If the cache has expired then Rails is hit again and the static file is regenerated with the updated content ready for the next request With an HTTP reverse proxy cache the Rails process is hit when the proxy needs to determine whether the content is stale or not. This is done using various HTTP headers such as ETag, Last-Modified etc. If the content is fresh then Rails responds to the proxy with an HTTP 304 Not Modified and the proxy serves its cached content to the browser, or even better, responds with its own HTTP 304. If the content is stale then Rails serves the updated content to the proxy which caches it and then serves it to the browser If my understanding is correct, then doesn't page caching result in less hits to the Rails process? There isn't all that back and forth to determine if the content is stale, meaning better performance than reverse proxy caching. Why might you use both techniques in conjunction?

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• Is reverse engineering evil?

  - by Amir Arad

  Lately I've been pondering on how a specific beloved old game actually works. I had some mild progress, but then a friend pointed out that if I really loved the game and appreciate it, I wouldn't try to reverse-engineer it. Note that the game is long considered an abandonware and is offerd for download publicly in lawful game sites, and I have no commercial / other large scale intentions - just to learn and "mess around" with it. Did I miss something? Is there an ethical taboo regarding reverse-engeneering? Alternatively, is there a legal issue?

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• Determine nginx reverse-proxy load limits

  - by Aaron

  Hi all: I have an nginx server (CentOS 5.3, linux) that I'm using as a reverse-proxy load-balancer in front of 8 ruby on rails application servers. As our load on these servers increases, I'm beginning to wonder at what point will the nginx server become a bottleneck? The CPUs are hardly used, but that's to be expected. The memory seems to be fine. No IO to speak of. So is my only limitation bandwidth on the NICs? Currently, according to some cacti graphs, the server is hitting around 700Kbps ( 5 min average ) on each NIC during high load. I would think this is still pretty low. Or, will the limit be in sockets or some other resource in the operating system? Thanks for any thoughts and insights. Aaron

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• Using apache reverse proxy for Domino inotes 8.5

  - by Haider

  I have setup access for the users to their mailfiles on Domino 8.5.1 using Inotes. The reverse proxy in use is Apache. It works fine. This is the current configuration i am using. Virtual host is commented out. The user types e.f.g.h and is being pointed to a.b.c.d and this works correctly without using virtual host. How would i implement this using Virtual Host # <VirtualHost ServerName ??? ProxyRequests off ProxyPass / `http://a.b.c.d/ ProxyPassReverse / `http://a.b.c.d/ ProxyPreserveHost On <Location / ProxyHTMLEnable On ProxyHTMLURLMap / / RequestHeader unset Accept-Encoding </Location </VirtualHost

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• Reverse proxy with SSL and IP passthrough?

  - by Paul

  Turns out that the IP of a much-needed new website is blocked from inside our organization's network for reasons that will take weeks to fix. In the meantime, could we set up a reverse proxy on an Internet-based server which will forward SSL traffic and perhaps client IPs to the external site? Load will be light. No need to terminate SSL on the proxy. We may be able to poison DNS so original URL can work. How do I learn if I need URL rewriting? Squid/apache/nginx/something else? Setup would be fastest on Win 2000, but other OSes are OK if that would help. Simple and quick are good since it's a temporary solution. Thanks for your thoughts!

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• How to handle certificates on a Apache reverse-proxy

  - by Helder

  Ok, so I was able to assemble an Apache for reverse proxy a bunch of internal sites. However, those sites use SSL. For the moment, and for testing purposes, I'm using self-signed certificates from the Apache box. I'm proxying a couple of OWA sites, and 2 https management consoles for a couple of appliances. I'm using name-based vhosts, and it's working fine (using Apache 2.2.14). However, I want to use the original, correct certificates. I have the original "3rd-party" certificates for all the sites, in .cer and .p7b format, and my question is: can I convert the certificates into something Apache will accept? Or will I need to generate new certificates, from the Apache box? Thanks!

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• Ngnix as reverse proxy for Apache name-based vhosts

  - by Ben Carleton

  I am running several websites on Apache currently utilizing name-based vhosts. All of the sites are on the same server. I would like to add Ngnix on a new server to sit in front of Apache as a caching reverse proxy. What is the best way to handle the multiple name-based vhosts? Should I simply have Nginx handle the names and run each Apache vhost on a separate port? Or is there a way to just have Nginx pass the hostname to Apache and have apache take care of the domain names?

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• Reverse Proxy Methods for Hosting a Low-Bandwidth Dynamic Website

  - by Casey

  I am building a webcam w/ HTTP server that will be running from a low-bandwith connection. The content on the site will be changing every 5 to 10 minutes. Instead of serving files directly from this connection, are there hosting companies that can act as a reverse proxy for my site? Therefore, if nobody is using the site, the local internet connection remains idle. And if I receive 1000 hits all at the same time, only one HTTP GET is required, and the hosting company (on a fat pipe) continues serving the other 999 requests? This doesn't sound like a very common usage model, but I feel like this would be the optimal solution to my situation.

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• Getting live traffic/visitor analytics when using a reverse proxy

  - by jotto

  I'm in process of implementing Varnish as a reverse proxy for a Ruby on Rails app and I'm using Google Analytics (JS/client side script to record visitor data) but it's several hours delayed so its useless for knowing what's going on now. I need at a glance live data that includes referring traffic and what current req/sec is. Right now I am using a simple Rack middleware application to do the live stats (gist.github.com/235745) but if the majority of traffic hits Varnish, Rack will never be hit so this won't work. The closest solution I've found so far is http://www.reinvigorate.net/ but it's in beta (there are also no implementation details on their front page). Does Varnish have traffic logs that I can custom format to match my Apache logs so I can combine them, or will I have to roll my own JS implementation like GA that shows the data in real time?

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• solr reverse proxy Apache2

  - by Steven

  I am trying to setup Apache2 as Reverse Proxy for solr. Apache and Solr are on the same machine. Apache is serving other stuff as regular web server,too. solsearch config file in /etc/apache2/config.d/ # Proxy specific settings ProxyRequests Off ProxyPreserveHost Off <Proxy *> AddDefaultCharset off Order deny,allow Allow from all </Proxy> ProxyPass /solrsearch http://localhost:8983/solr/collection1/browse ProxyPassReverse /solrsearch http://localhost:8983/solr/collection1/browse Now trying [http://localhost/solsearch] gives me the first page of [http://localhost:8983/solr/collection1/browse], but with broken layout (like css missing). Result: error.log of apache: File does not exist: /var/www/solr, referer: [http://192.168.1.150/solrsearch]

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• Can I port forward to an established reverse ssh tunnel

  - by Ben Holness

  I have three computers, A, B and C A has initiated a reverse ssh tunnel to B: ssh -nTNx -p 443 -R 22222:localhost:22 [user]@[server] If I log in to B, I can use 'ssh -p 22222 localhost' and I get a login prompt for A. If I try 'ssh -p 22222 [public IP of B]', it doesn't work What I would like to be able to do is have C connect to A without needing to login to B. So from C I could 'ssh -p 22222 [public IP of B]' and I would get the login prompt for A. I am using debian and shorewall and I have a basic understanding of how things work. I have tried various combinations of REDIRECT and DNAT rules, but haven't had any luck. I have tried using the same port (22222) and a different port (forwarding 22223 from C to 22222 on localhost). Any ideas? Cheers, Ben

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• Apache server as reverse proxy is removing xmlns info from html tag

  - by Johnco

  I have a Java application running in tomcat, in front of which I have an Apache http server as a reverse proxy. However, the proxy is removing all xmlns data from the html tag, which breaks all the Facebook's FBML which is never parsed. My current config is as follows: ProxyRequests off ProxyHTMLDocType XHTML ProxyPassReverseCookiePath /cas / <Location /> ProxyPass http://localhost:8080/cas ProxyPassReverse http://localhost:8080/cas </Location> ProxyHTMLURLMap /cas / SetOutputFilter proxy-html <Proxy *> Order deny,allow Allow from all Satisfy all </Proxy> Thanks in advance.

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• Nginx reverse proxy + URL rewrite

  - by jeffreyveon

  Nginx is running on port 80, and I'm using it to reverse proxy URLs with path /foo to port 3200 this way: location /foo { proxy_pass http://localhost:3200; proxy_redirect off; proxy_set_header Host $host; } This works fine, but I have an application on port 3200, for which I don't want the initial /foo to be sent to. That is - when I access http://localhost/foo/bar, I want only /bar to be the path as received by the app. So I tried adding this line: rewrite ^(.*)foo(.*)$ http://localhost:3200/$2 permanent; This causes 302 redirect (change in URL), but I want 301. What should I do?

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• Apache server as reverse proxy is removing xmlns info from html tag

  - by Johnco

  I have a Java application running in tomcat, in front of which I have an Apache http server as a reverse proxy. However, the proxy is removing all xmlns data from the html tag, which breaks all the Facebook's FBML which is never parsed. My current config is as follows: ProxyRequests off ProxyHTMLDocType XHTML ProxyPassReverseCookiePath /cas / <Location /> ProxyPass http://localhost:8080/cas ProxyPassReverse http://localhost:8080/cas </Location> ProxyHTMLURLMap /cas / SetOutputFilter proxy-html <Proxy *> Order deny,allow Allow from all Satisfy all </Proxy> Thanks in advance.

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• google analytics reverse transaction not working with sales performance

  - by prasad maganti

  We have google analytics account and trying to do reverse transaction. We have created a transaction on one date and reverse transaction on some other date. After transaction if we do reverse transaction it disappears from transactions list. Is it the expected behavior or abnormal behavior? But, if we check the same order data in sales performance, the reverse transaction does not reflects on when we created the transaction, it reflecting on when we made reverse transaction date. It should not be do like this. The reverse transaction should affect the same date on when we made transaction date.

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• Caching Reverse-Proxy ISP Host for a Low-Bandwidth Server

  - by Casey

  I am building a webcam w/ HTTP server that will be running from a low-bandwith connection. The content on the site will be changing every 5 to 10 minutes. Instead of serving files directly from this connection, are there hosting companies that can act as a reverse proxy for my site? Therefore, if nobody is using the site, the local internet connection remains idle. And if I receive 1000 hits all at the same time, only one HTTP GET is required, and the hosting company (on a fat pipe) continues serving the other 999 requests? This doesn't sound like a very common usage model, but I feel like this would be the optimal solution to my situation.

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• Apache reverse proxy, redirect requests based on IP addresses

  - by Mr Aleph

  I have a Linux box with 2 NICs. I installed and configured Apache 2 for reverse proxy. Each NIC has its own IP address and I was wondering if there is any way to redirect the requests via Apache based on the IP address that was used to get to the box. For example: eth0 has IP 100.100.100.100, eth1 has 200.200.200.200 If I browse to http://100.100.100.100/AppName/App I want it to redirect to 1.1.1.1 and if I browse to http://200.200.200.200/AppName/App I want it to go to 2.2.2.2 Right now the configuration for Apache is set as follow ProxyPass /AppName/App http://1.1.1.1/AppName/App ProxyPassReverse /AppName/App http://1.1.1.1/AppName/App So anything going to /AppName/App will be redirected to 1.1.1.1 I was reading something about ProxyHTMLURLMap but I don't know whether this is something that might help. Any idea how to do this? Thanks!

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• phpbb behind a reverse proxy

  - by asciitaxi

  Hi, i've got a django app running on apache behind an nginx reverse proxy. Nginx takes requests on port 80 and forwards them to apache on 127.0.0.1:81. This works fine. Now I want to run phpbb on apache under /forums. My problem is that when phpbb does a redirect, it seems to redirect to the internal apache port, rather than port 80. So, for instance when I first go to http://my-dev-server/forums to configure php bb, it immediately redirects to http://127.0.0.1:81/forums/install/index.php. Is there something I need to do in nginx/apache/phpbb config to get it to redirect to the external port? Thanks very much!

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• Configuring squid as reverse proxy

  - by Hassan

  I am having trouble configuring squid to work as reverse proxy here is my scenario squid is installed on server with ip 10.1.1.139 I have another computer that is acting as my proxy server 10.1.85.106 which has access to 10.1.85.106/program I want 10.1.1.139/program to be redirected to 10.1.85.106 I have added cache_peer 10.1.85.106 parent 80 0 no-query originserver name=server_1 cache_peer_domain server_1 /program /program/ program when I go to 10.1.1.139/program I get "The following error was encountered while trying to retrieve the URL: /program Invalid URL" Since the error is not related to access denied I don't think it is due to access restrictions. Do I need to add anything else? Thanks for your time

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• Squid - Selective reverse proxy and forward proxy

  - by Dean Smith

  I'd like to setup a squid instance to do selective reverse proxy for a configured list of URLs whilst acting as a normal forward proxy for everything else. We are building new infrastructure, parallel live as it where, and I want to have a proxy that people can use that will force selective traffic into the new platform whilst just acting as a forward proxy for anything else. This makes it very easy for people/systems to test the portions of the new platform we want without having to change too much, just use a proxy address. Is such a setup possible ?

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• Nginx vs Apache as reverse proxy, which one to choose

  - by mhd

  Hi, this kind of question maybe has been asked here but I couldn't find any that really match my question. Heard that nginx performance is quite impressive, but Apache has more docs, community(read:expert) to get help Now what I want to know, how both web servers compare in term of performance, easiness of config, level of customization,etc. AS REVERSE PROXY server in a vps environment?? I'm still weighing between the two for a ruby web app(not ROR) served with thin server. Specific answer will be much appreciated. General answer not touching the ruby part is okay. I'm still noob in web server administration.

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• Reverse proxy for a subdirectory in nginx

  - by Maple

  I want to set up a Reverse proxy on my VPS for my Heroku app (http://lovemaple.heroku.com) So if I visit mysite.com/blog I can get the content in http://lovemaple.heroku.com I followed the instructions on the Apache wiki. location /couchdb { rewrite /couchdb/(.*) /$1 break; proxy_pass http://localhost:5984; proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } I changed it to fit my situation: location /blog { rewrite /blog/(.*) /$1 break; proxy_pass http://lovemaple.heroku.com; proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } When I visit mysite.com/blog, the page show up, but js/css file cannot be gotten (404). Their link becomes mysite.com/style.css but not mysite.com/blog/style.css. What's wrong and how can I fix it?

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• Reverse proxy with SSL and IP passthrough?

  - by Paul

  Turns out that the IP of a much-needed new website is blocked from inside our organization's network for reasons that will take weeks to fix. In the meantime, could we set up a reverse proxy on an Internet-based server which will forward SSL traffic and perhaps client IPs to the external site? Load will be light. No need to terminate SSL on the proxy. We may be able to poison DNS so original URL can work. How do I learn if I need URL rewriting? Squid/apache/nginx/something else? Setup would be fastest on Win 2000, but other OSes are OK if that would help. Simple and quick are good since it's a temporary solution. Thanks for your thoughts!

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