Hi.
On 18.07.2017 14:09, Jan Hlavatý wrote:
Hello,
I can't seem to figure out the proper setup for the situation where I
have multiple webhosts behind a reverse proxy server being forwarded to
Tomcat.
There can be only one proxyHost and proxyPort on a Connector but I have
multiple Hosts and Aliases.
How am I supposed to do that? Make multiple Connectors one per hostname,
on different local ports, sharing on Executor to avoid multiplying
threads, and have the proxy forward to different ports based on hostname?
No to all that. All you need is multiple <Host> entries in the tomcat
server.xml config.
A single <Connector> (and port) will do for all. <Executor> is optional, and indeed
relates to optimising the usage of threads.
Other than that, I don't really know at what level to begin explaining why.
Let's try this :
In HTTP 1.1 and above, when a browser sends a request to a server, it adds a header line
to each request :
Host: some.server.com
The receiving HTTP server reads this header, and that is what tells it to which of it's
"hosts" this request is adressed.
If you have a front-end reverse proxy, and say 10 virtual hosts, then each of these
virtual host names is configured in the DNS to resolve to the IP address of your proxy.
So the front-end proxy receives all requests directed to any of these hosts.
It then belongs to the proxy, to forward all these requests to the single back-end Tomcat
server, and include the original "Host:" header in the requests that it proxies so.
The single Tomcat Connector will receive all these requests, and will dispatch them to
each individual <Host> in function of that same "Host:" header.
Clear ?
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