GET vs. POST Best Practices

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Please use POST for anything that modifies persistent state in the database. You don’t want crawlers visiting your delete links!
Have a read at Architecture of the World Wide Web, Volume One and URIs, Addressability, and the use of HTTP GET and POST by W3C.

Edit: Sometimes though you need to use GET. For example membership activation URLs which are sent in emails are GET and need to somehow modify the database.

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