Rewrite rule error: HTTP Error 500.50 - URL Rewrite Module Error. The expression "https://abc.com/{R:1}" cannot be expanded

Question

Whenever someone makes request over HTTP protocol I rewrite the url to make it HTTPS. This is the code in web.config:

<rule name="Imported Rule 1-1" enabled="true" stopProcessing="true">
    <match url="^(?!https://).*" ignoreCase="false" />
    <conditions logicalGrouping="MatchAll">
        <add input="{SERVER_PORT}" pattern="80" ignoreCase="false" />
    </conditions>
    <action type="Rewrite" url="https://abc.com/{R:1}" />
</rule>

However when I browse on http:// I get IIS error

HTTP Error 500.50 - URL Rewrite Module Error. The expression "https://abc.com/{R:1}" cannot be expanded.

How can I resolve this? I am utterly confused.

I'm getting this also now. Did you ever find a solution? If so, please post it here. — Shaul Behr, Mar 15 '12 at 06:44

score 21 · Accepted Answer · answered Mar 30 '12 at 21:06

21

The matches are zero based.

<action type="Rewrite" url="https://abc.com/{R:1}" />

Won't work because you only have one match. You need:

<action type="Rewrite" url="https://abc.com/{R:0}" />

Also, this won't work, because you can only match on the path below the site root.

<match url="^(?!https://).*" ignoreCase="false" />

It looks like you are checking for ssl. Try this instead:

      <conditions logicalGrouping="MatchAll" trackAllCaptures="false">
        <add input="{HTTPS}" pattern="^OFF$" />
      </conditions>

answered Mar 30 '12 at 21:06

SouthShoreAK

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2

While the matches are zero-based, the first match `{R:0}` *always* contains the full string matched, and the second match `{R:1}` matches the *first* capture group within `{R:0}`. So, this answer is incorrect in the first part. You can see for yourself in the "Test Pattern" dialog. – jpaugh Aug 18 '20 at 21:02
@jpaugh I wonder if it changed in the 10 years since I wrote the answer? I know it worked when I wrote it because I had just solved exactly the problem OP was having. – SouthShoreAK Aug 16 '22 at 15:22
This convention matches [PCRE](https://stackoverflow.com/tags/pcre), so I can't imagine that it changed. It's also possible the OP corrected it without a second thought. – jpaugh Jan 18 '23 at 17:39

score -2 · Answer 2 · answered Jan 07 '14 at 10:46

You can redirect through web config to Hope it will help full

<rule name="Redirect to WWW" stopProcessing="true">
  <match url=".*" />
     <conditions>
       <add input="{HTTP_HOST}" pattern="^abc.com$" />
     </conditions>
  <action type="Redirect" url="http://www.abc.com/{R:0}" redirectType="Permanent" />
</rule>

Rewrite rule error: HTTP Error 500.50 - URL Rewrite Module Error. The expression "https://abc.com/{R:1}" cannot be expanded

2 Answers2

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