: Do query string case differences affect whether a URL is Canonical? If I have two URL's where the only difference is the case of the query string: http://example.com?param=TEST http://example.com?param=test

@Angela700

Yes, all parts of URL after the domain name are case sensitive.

Also, query string case is important not just for search engines but it may be important for your server as well.

You may have the following download link:
example.com?download=/myVideos/CaseSensitiveVideo.mpeg

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@Eichhorn148

URLs that differ in case in the query string are different URLs to search engines. They are not considered equal and would need canonical tags or redirects to tell search engines which you prefer.

Different parts of the URL are different in terms of case sensitivity:


Protocol (http) -- case insensitive
Host name (example.com) -- case insensitive
Path (/folder/document.html) -- case sensitive
Query string (?foo=bar&fuzz=bat) -- case sensitive

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