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It seems by default its proxy connection keep-alive as the header states:

Keep-Alive: 300
Proxy-Connection: keep-alive

How can I disable this?

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up vote 1 down vote accepted

Type about:config in the address bar. change this value to false.

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Although keep in mind this is more or less an obsolete setting as of http 1.1 – Blomkvist May 19 '11 at 15:58

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