Pass Parameters to an HTTP Server 

Send parameters to a server.

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X URLFetch["http://exampledata.wolfram.com/getJSON.php", "Parameters" -> {"title" -> "A New Kind of Science", "author" -> "Stephen Wolfram", "published" -> "2002"}]

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Send passwords to a server.

In[2]:=

X URLFetch["http://exampledata.wolfram.com/authentication.php", "Username" -> "Joe", "Password" -> "topsecret"]

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Manually pass headers to an HTTP server.

In[3]:=

X URLFetch["http://exampledata.wolfram.com/headers.php", "Headers" -> {"MyHeader" -> "42"}]

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