Re: Apache - ProxyPass issue -- pls suggest

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On Sun, Oct 14, 2012 at 5:22 PM, vivek aggarwal
<vicky007aggarwal@xxxxxxxxxxx> wrote:
> Folks,
>
> I am not able to forward the request from apache to tomcat when i am using
> the following configuration for ProxyPass elements :
>
> <VirtualHost *:80>
> ServerName vicky.com
> ProxyPass /    http://localhost:8080/kdah
> ProxyPassReverse /    http://localhost:8080/kdah
> ErrorLog logs/vicky_error.log
> </VirtualHost>
> But its working when i am using the context root(any  string value eg:- /kd
> ) as mentioned below
>
>
> <VirtualHost *:80>
> ServerName vicky.com
> ProxyPass /kd   http://localhost:8080/kdah
> ProxyPassReverse /kd   http://localhost:8080/kdah
> ErrorLog logs/vicky_error.log
> </VirtualHost>
> Please suggest why is it like that ??????
>
>
> Vicky

ProxyPass and ProxyPassReverse do string manipulation of the URL. This
is your non-working example:

ProxyPass /    http://localhost:8080/kdah
ProxyPassReverse /    http://localhost:8080/kdah

The first line says "Replace the string '/' with the string
'http://localhost:8080/kdah' at the start of the URL". So, if the URL
is '/example/page", the replacement is
"http://localhost:8080/kdahexample/page"; - does that look right?

The second line says "In certain response headers, replace the string
'http://localhost:8080/kdah' with the string '/' at the start of the
URL". So, if the URL is "http://localhost:8080/kdah/example";, the
replacement is "//example" - does that look right?

The reason they don't look right is that the URLs do not match up
correctly. If the URL on the left ends in a '/', so must the one on
the right, or the string manipulations will not work correctly. Eg:

ProxyPass /    http://localhost:8080/kdah
ProxyPassReverse /    http://localhost:8080/kdah

Neither of these two are right, because the URLs on the left end in a
'/' and the URLs on the right do not. The following should work
correctly.

ProxyPass /    http://localhost:8080/kdah/
ProxyPassReverse /    http://localhost:8080/kdah/

I wish some note about 'match the slashes' up could go in the
documentation, I follow this simple rule and never have any issues
setting up reverse proxies.

Cheers

Tom

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