regex - Rewrite rule to HTTPS except when on localhost

Question

I am using the answer given here as the basis for trying to add a rewrite rule to my web.config file. I want it to match any url that is not running on localhost in order to force https.

Here is what I have right now:

<system.webServer>
  <rewrite> <!-- force https - https://stackoverflow.com/a/15119044/51 -->
    <rules>
      <rule name="Redirect HTTP to HTTPS" stopProcessing="true">
        <match url="^((?!localhost).)*$"/>
        <conditions>
          <add input="{HTTPS}" pattern="^OFF$"/>
        </conditions>
        <action type="Redirect" url="https://{HTTP_HOST}/{R:1}" redirectType="SeeOther"/>
      </rule>
    </rules>
  </rewrite>
</system.webServer>

I am trying to use a negative lookaround in order to only match url's that do not include "localhost" within the url. But this is not working.

So how should this rule be set up in order to only rewrite non-localhost url's?

question from:https://stackoverflow.com/questions/20947773/rewrite-rule-to-https-except-when-on-localhost

Answer 1

Try this condition:

<system.webServer>
  <rewrite>
    <rules>
      <rule name="Redirect HTTP to HTTPS" stopProcessing="true">
        <match url="^(.*)$"/>
        <conditions>
          <add input="{HTTPS}" pattern="^OFF$"/>
          <add input="{HTTP_HOST}" matchType="Pattern" pattern="^localhost$" negate="true" /> 
        </conditions>
        <action type="Redirect" url="https://{HTTP_HOST}/{R:1}" redirectType="SeeOther"/>
      </rule>
    </rules>
  </rewrite>
</system.webServer>

Using a negate condition against the localhost pattern should do the trick.