Using server variables in IIS rewirte rules

Question

Hello,

I am trying to create a rewrite rule that will proxy all requests under selected path to my search API so I created a rewrite rule like this:

<rule name="Rewrite Search requests to SOLR">
    <match url="^search-api" />
    <action type="Rewrite" url="http://dev.search-api/select" logRewrittenUrl="true" />
</rule>

I have multiple environments, each is pointing to different search server, so lets say on the first env I need to proxy to
http://dev.search-api/select and on the other one I need to proxy to http://int.search-api/select

I want to keep my web.config file in source control and use the same file for my all envs so my question is: is there a way to use some kind of custom variable in the rewrite rules so I would have rule like this:

<rule name="Rewrite Search requests to SOLR">
    <match url="^search-api" />
    <action type="Rewrite" url="http://{MY_VARIABLE_SET_SOMEWHERE}/select" logRewrittenUrl="true" />
</rule>

and then just set MY_VARIABLE_SET_SOMEWHERE somewhere ?

Could you please advise ?

Answer 1

Hi @Bartosz Wesołowski ,

As far as I know, we can't implement this in web.config. We can just define a key-value in <appSettings> and then use the value in xxx.cs file. But we can not define a variable somewhere and use the variable in rewrite rule in web.config.

For this requirement, I think you can just edit the rule of your web.config. Or if you do not want to modify the web.config, you can also do it in "global.asax".

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