insert null character using tamper data

Question

Using the firefox extension tamper data (for modifing http requests that firefox makes) how do I insert a null character into a post field? I can enter normal characters, but binary characters in it are not urlencoded and are shown as is, so how do I enter the null character into a field? If you know of a firefox extension like tamper data that I can do this or a way to do this using tamper data please post.

Answer 1

Would %00 work?

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I used to use burp proxy - it's a standalone Java program acting as a HTTP proxy, so can be used for anything.