Case-sensitivity

From Well Designed Urls WiKi

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Contents 1 Mike Schinkel's Opinion 2 Example URLs 3 External Links 4 Footnotes

Mike Schinkel's Opinion

In my current opinion HTTP URLs:

• SHOULD NOT BE case-sensitive. Users really don't understand the distinction between a URL like URL #1. and URL #2. and it is rarely if ever necessary.
• SHOULD HAVE their Authority [1] and Path [2] in all lower-case like URL #1.
• SHOULD issue a Permanent (301) Redirect to the lower-case equivalent whenever a URL is requested that contains upper-case characters like URL #2.
• SHOULD NOT change the case of Querystring parameter values (i.e. Do not coverted "Yes" in URL #3. to lower-case.)
• CAN have their parameter names lower-cased but it won't affect anything either way (i.e. "Print=" CAN be coverted to lower-case in URL #3. to look like URL #4. if desired.)
• CAN have their Fragment [3] lower-cased but it doesn't have to be (i.e. "#Summary" CAN be coverted to lower-case as in URL #7. to look like URL #8. if desired.)

I am continuing to do research on this subject and plan a signifcant blog post article at blog.welldesignedurls.org.

Example URLs

1. http://www.example.com/my-topic/
2. http://www.example.com/My-Topic/
3. http://www.example.com/my-topic/?Print=Yes
4. http://www.example.com/my-topic/?print=Yes
5. username@www.example.com:8888
6. http://username@www.example.com:8888/my-topic/?print=Yes
7. http://www.example.com/my-topic/#Summary
8. http://www.example.com/my-topic/#summary
9. http://www.example.com/my-topic/?print=Yes#summary

External Links

• http://urls.inelegant.org/lowercase/

Footnotes

[1] - The Authority for URLs on the public web is just the Domain (i.e. www.example.com). Sometimes the Domain can be suffixed by a Port (i.e. :8888) and much more rarely prefixed by a Userinfo (i.e. username@). In the rarest of cases the Authority would look like that in Example #5.; see URL #6. for that Authority included in a complete and valid URL.

[2] - The Path starts with the first "/" if there is one and ends with "?", "#", or the end of the URL (i.e. /my-topic/ in URLs #1, 3, 4, 6, 7, 8, & 9 and /My-Topic/ in URL #2.)

[3] - The Fragment comes after the "#" and typically allows the browser to just to a specific location in a Web Page.