IIS Proxy Re-Encoding URLs Containing Percentage (%)

Question

I am trying to configure a reverse proxy for Jenkins using IIS 7.5, Application Request Routing 3.0 (ARR), and URL Rewrite 2.0.

I have a proxy server that works mostly, but I am facing problems with URLs containing the percent sign (%).

No matter what I try, the proxy insists on either encoding or re-encoding the percent sign in the rewritten URL.

This is how I want the URLs to be rewritten:

http://my.proxy/a%2Fb -> http://my.host:8080/a%2Fb

Here's how the URLs really correspond:

http://my.proxy/a%2Fb -> http://my.host:8080/a/b
- or -
http://my.proxy/a%2Fb -> http://my.host:8080/a%252Fb

How can I get IIS \ ARR \ Rewrite to stop recoding my rewritten URLs?

What I tried:

• ( URL http://my.host:8080/a/b):

  <rule name="ReverseProxyInboundRule1" stopProcessing="true"> <match url="(.*)" ignoreCase="true" /> <action type="Rewrite" url="http://my.host:8080/{R:1}" /> </rule>

• UNENCODED_URL ( URL http://my.host:8080/a%252Fb):

  <rule name="ReverseProxyInboundRule1" stopProcessing="true"> <match url="(.*)" ignoreCase="false" /> <conditions logicalGrouping="MatchAll"> <add input="{UNENCODED_URL}" pattern="/(.*)" /> </conditions> <action type="Rewrite" url="http://my.host:8080/{C:1}" /> </rule>

• URL ( - URL http://my.host:8080/a%252Fb):

  <rule name="ReverseProxyInboundRule1" stopProcessing="true"> <match url="(.*)" ignoreCase="false" /> <action type="Rewrite" url="http://my.host:8080/a%2Fb" /> </rule>

• Scott Hanselman " Wackiness: , ASP.NET/URL- IIS "

  • <httpRuntime requestValidationMode="2.0" requestPathInvalidCharacters="*,:,&amp;,\" relaxedUrlToFileSystemMapping="true" />
  • <security> <requestFiltering allowDoubleEscaping="true" /> </security>'

. , IIS - Jenkins, HTTP- URL- .

Answer 1

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https://gist.github.com/gralin/b5edfd908a41fc7268a7757698af1e66

Answer 2

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<system.webServer>
    <security>
        <requestFiltering>
            <requestLimits maxQueryString="4000" maxUrl="2000" />
        </requestFiltering>
    </security>
    <rewrite>...</rewrite>
    ...
</system.webServer>

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Answer 3

, useOriginalURLEncoding="false":

<rules useOriginalURLEncoding="false">
    <rule name="ReverseProxyInboundRule1" stopProcessing="true">
        <match url="(.*)" ignoreCase="false" />
        <conditions logicalGrouping="MatchAll">
            <add input="{UNENCODED_URL}" pattern="/(.*)" />
        </conditions>
        <action type="Rewrite" url="http://my.host:8080/{C:1}" />
    </rule>
</rules>

. useOriginalURLEncoding .