URL Rewrite module for IIS7 Not Handling Rewrite Rule Correctly

I have the attached redirect and rewrite rules. Essentially, www.foo.com/vehicles/vehicle-detail.aspx?stockno=123456 is rewritten to www.foo.com/123456. This works as expected with the rules I have in place. Now, if I attempt to browse to a page that does not exist (i.e. www.foo.com/test.aspx) the rewrite rule qualifies and IIS attempts to forward the request to www.foo.com/vehicles/vehicle-detail.aspx (without the querystring). On the vehicle-detail.aspx page I have code to redirect to the homepage if there isnt a valid stockno in the querystring, so this is what is happening. I am not sure how to correct the rule(s), so that the condition does not qualify as true. I have attached rules and screenshots of Failed Request Tracing I enabled to watch the request/rewrite rule.

<rule name="Redirect StockNo" enabled="true" stopProcessing="true">
<match url="^Vehicles/Vehicle-Detail\.aspx$" />
<conditions logicalGrouping="MatchAll" trackAllCaptures="false"开发者_开发知识库>
    <add input="{REQUEST_METHOD}" pattern="^POST$" negate="true" />
    <add input="{QUERY_STRING}" pattern="^stockno=([^=&amp;]+)$" />
</conditions>
<action type="Redirect" url="{C:1}" appendQueryString="false" />

<rule name="Rewrite StockNo" enabled="true" stopProcessing="true">
<match url="^([^/]+)/?$" />
<conditions logicalGrouping="MatchAll" trackAllCaptures="false">
    <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
    <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
</conditions>
<action type="Rewrite" url="Vehicles/Vehicle-Detail.aspx?stockno={R:1}" />

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What you need is something more unique for the friendly pattern. If you know that it's always going to be digits, you can have:

<match url="^([\d]+)/?$" />

This will only match to www.foo.com/{digits} with an optional trailing slash.

Another option is to make the url something like www.foo.com/s/{stockno}/. With the /s/ you have something unique that you can confidently match. S is just an example that is short for stockno, so you can use what you want.