IIS URL Rewrite: Add trailing slash except for .html and .aspx

Question

Adding a trailing slash to all URLs through IIS URL Rewrite Module is widely spread, but how do I add exceptions for URLs that ends with .html and .aspx?

Today I have this:

<rule name="Add trailing slash" stopProcessing="true">
  <match url="(.*[^/])$" />
  <conditions>
    <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
    <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
    <!-- Doesn't seem to be working -->
    <!--<add input="{REQUEST_URI}" pattern="(.*?).html$" negate="true" />-->
    <!--<add input="{REQUEST_URI}" pattern="(.*?).aspx$" negate="true" />-->
  </conditions>
  <action type="Redirect" redirectType="Permanent" url="{R:1}/" />
</rule>

Do you want to block the rewrite for .aspx and .html extension? — A Developer, Oct 04 '12 at 09:46

Seb Nilsson · Accepted Answer · 2013-04-03T10:15:01.957

28

If you want something done right, you've got to do it yourself, obviously...

Here is the solution to my question:

<rule name="Add trailing slash" stopProcessing="true">
  <match url="(.*[^/])$" />
  <conditions>
    <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
    <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
    <add input="{REQUEST_FILENAME}" pattern="(.*?)\.html$" negate="true" />
    <add input="{REQUEST_FILENAME}" pattern="(.*?)\.aspx$" negate="true" />
  </conditions>
  <action type="Redirect" redirectType="Permanent" url="{R:1}/" />
</rule>

Update: I blogged about this in more detail.

edited Apr 03 '13 at 10:15

answered Oct 15 '12 at 10:08

Seb Nilsson

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This worked for me after installing the URL Rewrite module: http://www.iis.net/downloads/microsoft/url-rewrite – Micah Jan 17 '13 at 20:23
1

+1 this fixed an issue I was having in Wordpress (running on IIS) where the W3 Total Cache plugin was caching blank pages when trailing slash was missing. – IntricatePixels Apr 20 '13 at 17:38
3

Why are you negating matchType="IsDirectory"? Isn't this precisely the case where a trailing slash should be added? – Alex Czarto Mar 29 '17 at 14:33
@micah Would you know why images wont load (500) when this rule is applied? – Elinoter99 Jun 26 '19 at 20:54

score 18 · Answer 2 · answered Jul 10 '13 at 23:56

Varying the other answers, I used this so I wouldn't have to specify a list of file extensions:

<!-- Ensure trailing slash -->
<rule name="Add trailing slash" stopProcessing="true">
  <match url="(.*[^/])$" />
  <conditions>
    <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
    <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
    <add input="{REQUEST_FILENAME}" pattern="(.*?)\.[a-zA-Z]{1,4}$" negate="true" />
  </conditions>
  <action type="Redirect" redirectType="Permanent" url="{R:1}/" />
</rule>

this is worked for me , thanks for saving my time. :) – Vishal Sen May 25 '18 at 05:43 — Vishal Sen, May 25 '18 at 05:43

score 3 · Answer 3 · answered Jun 12 '13 at 18:21

3

We add multiple extensions like this:

<add input="{URL}" negate="true" pattern="((.+).(jpg|ico|gif|js|png|htm|css|html))" ignoreCase="true" />

answered Jun 12 '13 at 18:21

Denis

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Garland Pope · Answer 4 · 2017-03-14T21:05:00.553

To prevent all files from having a slash added, I changed the match rule to this:

<match url="^([^.]*[^/])$" />

That applies the rule only to paths that include any number of non-dot characters that does not end in a slash. So any path that includes a dot (e.g. xxx.html, xxx.aspx, etc.) would be excluded without needing any additional negation rule.

Looking for the presence of a dot in the match rule allowed me to completely remove the condition rules that use match types IsFile and IsDirectory. Those match types are only allowed in distributed rules (web.config), not in the global rules (applicationHost.config), so I had been forced to replicate this rule for every site instead of applying it to all sites using a global rule. By modifying the regex in the match rule to exclude files and removing the IsFile and IsDirectory conditions, I was able to create a global rule instead of having multiple distributed rules.

score 1 · Answer 5 · answered Nov 09 '19 at 05:55

1

            <conditions>
                <add input="{URL}" pattern="(.*)\.(.*)[a-z]$" negate="true" />
                <add input="{URL}" pattern="(.*)\.(.*)[0-9]$" negate="true" />
            </conditions>

except for .html and .aspx and .woff2

answered Nov 09 '19 at 05:55

MyPhuong Tran

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score 0 · Answer 6 · answered Jan 15 '13 at 13:30

0

This almost worked for me. I had to change it to

<add input="{URL}" pattern="(.*?)\.html$" negate="true" />
<add input="{URL}" pattern="(.*?)\.aspx$" negate="true" />

Otherwise thanks for this!

answered Jan 15 '13 at 13:30

Colin Wiseman

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score 0 · Answer 7 · answered Jul 28 '19 at 11:23

To prevent POST, DELETE and other REST method calls without a trailing slash from erroneously becoming a GET request through the redirect consider adding the following condition:

<add input="{REQUEST_METHOD}" matchType="Pattern" pattern="GET" ignoreCase="true" />

score 0 · Answer 8 · edited Nov 10 '19 at 16:37

0

You can try this:

        <conditions>
            <add input="{URL}" pattern="(.*)\.(.*)$" negate="true" />
        </conditions>

edited Nov 10 '19 at 16:37

Dino

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answered Nov 10 '19 at 13:35

MyPhuong Tran

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Can you comment on why this Answer works a little? Solutions are always accepted, but knowing why is just as important as the fix :) – J. Murray Nov 10 '19 at 14:13

IIS URL Rewrite: Add trailing slash except for .html and .aspx

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