Awesome, thanks for the fix and insight! If a module writer's wiki
exists this should be added.

agentzh wrote:
> On Tue, Nov 24, 2009 at 12:38 PM, Mark Maunder <mark@feedjit.com> wrote:
>> The variable is set fine outside an 'if' statement but when the if evaluates
>> to true, the variable is not set.
>>
>
> Behind the scene, the if directive's "block" is implemented as a
> dynamic location (of type LIF, not LOC). It's very different from the
> if statements' blocks one usually finds in an everyday programming
> language :)
>
>> I have duplicated this behaviour with the echo module as follows:
>> This will print "No":
>> location ^~ /echo/ {
>> set $myText "No";
>> if ($remote_addr ~* '000'){
>> set $myText "Yes";
>> }
>> echo $myText;
>> }
>>
>
> Tests have shown that if the "if" condition succeeds here, nginx will
> return a 404 error page because of the lack of content handler in that
> anonymous location corresponding to the "if" block :)
>
> I've just released "echo" module v0.22 to allow you to use "echo"
> directly in "if" blocks and the following should work as expected:
>
> location ^~ /if {
> set $res miss;
> if ($arg_val ~* '^a') {
> set $res hit;
> echo $res;
> }
> echo $res;
> }
>
> GET /if?val=abc yields the "hit" output while GET /if?val=bcd yields "miss" :)
>
> It seems that the standard proxy_pass directive also works in if blocks (yay!):
>
> location ^~ /if {
> set $res miss;
> if ($arg_val ~* '^a') {
> set $res hit;
> proxy_pass $scheme://127.0.0.1:$server_port/foo?res=$res;
> }
> proxy_pass $scheme://127.0.0.1:$server_port/foo?res=$res;
> }
> location /foo {
> echo "res = $arg_res";
> }
>
> You will get the expected behavior :)
>
> Feel free to take a look at more related (passing) test cases that
> I've included in the "echo" module's test suite:
>
> http://github.com/agentzh/echo-nginx-module/blob/master/test/t/if.t
>
> Have fun with "if" and "echo"!
>
> Regards,
> -agentzh
>
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