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
– A Developer, Commented Oct 4, 2012 at 9:46

Seb Nilsson · Accepted Answer · 2013-04-03 10:15:01Z

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 3, 2013 at 10:15

answered Oct 15, 2012 at 10:08

Seb Nilsson

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5 Comments

Micah Githens Over a year ago

This worked for me after installing the URL Rewrite module: iis.net/downloads/microsoft/url-rewrite

IntricatePixels Over a year ago

+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.

Alex Czarto Over a year ago

Why are you negating matchType="IsDirectory"? Isn't this precisely the case where a trailing slash should be added?

Elinoter99 Over a year ago

@micah Would you know why images wont load (500) when this rule is applied?

Cryothic Over a year ago

@Elinoter99 Yes, because all image URL's are also getting a trailing slash ;)

Giscard Biamby · Accepted Answer · 2013-07-10 23:56:41Z

20

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>

answered Jul 10, 2013 at 23:56

Giscard Biamby

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1 Comment

Vishal Sen Over a year ago

this is worked for me , thanks for saving my time. :)

Denis · Accepted Answer · 2013-06-12 18:21:02Z

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, 2013 at 18:21

Denis

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Comments

Garland Pope · Accepted Answer · 2017-03-14 21:05:00Z

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.

MyPhuong Tran · Accepted Answer · 2019-11-09 05:55:50Z

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 9, 2019 at 5:55

MyPhuong Tran

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Comments

Colin Wiseman · Accepted Answer · 2013-01-15 13:30:52Z

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, 2013 at 13:30

Colin Wiseman

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Comments

Johan B · Accepted Answer · 2019-07-28 11:23:12Z

0

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" />

answered Jul 28, 2019 at 11:23

Johan B

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Comments

2 revs, 2 users 89% · Accepted Answer · 2019-11-10 16:37:53Z

0

You can try this:

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

edited Nov 10, 2019 at 16:37

community wiki

2 revs, 2 users 89%
MyPhuong Tran

1 Comment

J. Murray Over a year ago

Can you comment on why this Answer works a little? Solutions are always accepted, but knowing why is just as important as the fix :)

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