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Reading about Http Post on Wikipedia it states that This is a format for encoding key-value pairs with possibly duplicate keys. Is this correct and if so what is the reasoning? Why would a client ever post duplicate keys and if a duplicate key is posted how is the correct corresponding value returned on server side?
To submit multiple values for the same thing.
In PHP, for example, you can name multiple input fields
somedata[]. All values of the input boxes are then put in an array namedsomedata.