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a servlet/jsp question and HTTP_REFERER

Posted on 2006-11-07
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Last Modified: 2013-11-24
i have a jsp authentication form that posts to a servlet.
if the authentication fails(ie bad username) i want to send back message to the calling jsp.

i was going to use HTTP_REFERER and just send the message back to HTTP_REFERER , but i have been doing some reading and it appears that HTTP_REFERER  is not dependable. That some tools like norton will block this

so does any but know this for sure and how do other people handle this. For now i have a myreferer hidden in the jsp, but seems a little kludgy

Thanks for any help
Randy
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Question by:paries
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Expert Comment

by:CEHJ
ID: 17890443
You could use Ajax and thus not only be able to send a message to the caller, but do it without leaving the caller
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Author Comment

by:paries
ID: 17890464
yeah thats ok, but i am having all sorts of wonderful security problems with alot of my customers so ajax is only an option, which means you still have to write for the browsers that will not run ajax.

thanks
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Expert Comment

by:colr__
ID: 17890465
Or you could simply post back to the calling JSP with a url paramater that states that the login failed.
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Author Comment

by:paries
ID: 17890496
correct, but the question is , what is the best way to post back to the calling jsp?
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Author Comment

by:paries
ID: 17890502
how do i know what the calling jsp is?
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Expert Comment

by:CEHJ
ID: 17890530
You could make clients pass themselves as referer explicitly as one of the post params
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Author Comment

by:paries
ID: 17890552
k that i how this post started. That is exactly what i am doing now.
"For now i have a myreferer hidden in the jsp, but seems a little kludgy" I guess i should have said
"For now i have a myreferer as a hidden in the jsp, but seems a little kludgy"
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Expert Comment

by:CEHJ
ID: 17890616
Well what i'm suggesting is user interaction. What you're suggesting sounded like hard-coding...
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Author Comment

by:paries
ID: 17890822
ok i am confused
how do i "make clients pass themselves as referer explicitly as one of the post params"
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Expert Comment

by:colr__
ID: 17890877
<input type="hidden" name="referrer" value="thisPage.jsp" />
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Expert Comment

by:CEHJ
ID: 17890889
Try doing something like this in the onsubmit handler of the form

function submitForm() {
    document.forms[0].username.value = ...
    document.forms[0].password.value = ...
    document.forms[0].referer.value = document.location;
    return true;
}

..............

<input type="hidden" name="referer" value="" >
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CEHJ earned 500 total points
ID: 17890907
Or rather

document.forms[0].referer.value = document.location.href;
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Expert Comment

by:CEHJ
ID: 17891794
:-)
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