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Assume there are two servers; has a standard SSL certificate installed and has a wildcard SSL certificate (* installed.

Next, assume you make from server 1 via SSL connection an API call to

If someone eavesdrops on the connection, which URL of server2 would the sniffer see?

Would the sniffer see or the subdomain that was called

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Besides of SSL handshakes the eavesdropper could also see some DNS requests, which might reveal the actual called URL. –  Manuel Faux Nov 3 '13 at 15:12

1 Answer 1

up vote 2 down vote accepted

The Server Name Indication extension, now implemented by most SSL libraries, implies that a sniffer would see the name as part of the unencrypted ClientHello message from server1.

As for the rest of the URL (the path on server2), it is sent only after the handshake, so it is not visible to sniffers (but sniffers may still obtain a good estimate of the path length, in characters).

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