How do http proxies determine https traffic with a single port?

Posted by badunk on Server Fault See other posts from Server Fault or by badunk
Published on 2012-04-11T10:40:43Z Indexed on 2012/04/11 11:33 UTC
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ssl

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proxy

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http

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https

If a proxy receives the tcp packet, then the destination ip address and port are that of the proxy. In that case, I imagine the only way a proxy can still resolve the intended destination is either through routing the source ip address/port or through the host field in the http header. Is this correct?

In both Fiddler and Charles http proxies, I noticed that the tool accepts both http and https connections through a single port that you can specify. What do these tools do to tell the difference between the two types of connections?

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