Fix how the client checks for presence of Upgrade: websocket, Connection: upgrade#604
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elithrar merged 1 commit intogorilla:masterfrom Aug 20, 2020
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…ion: upgrade
The values of the `Upgrade` and `Connection` response headers can
contain multiple tokens, for example
Connection: upgrade, keep-alive
The WebSocket RFC describes the checking of these as follows:
2. If the response lacks an |Upgrade| header field or the |Upgrade|
header field contains a value that is not an ASCII case-
insensitive match for the value "websocket", the client MUST
_Fail the WebSocket Connection_.
3. If the response lacks a |Connection| header field or the
|Connection| header field doesn't contain a token that is an
ASCII case-insensitive match for the value "Upgrade", the client
MUST _Fail the WebSocket Connection_.
It is careful to note "contains a value", "contains a token".
Previously, the client would reject with "bad handshake" if the header
doesn't contain exactly the value it looks for.
Change the checks to use `tokenListContainsValue` instead, which is
incidentally what the server is already doing for similar checks.
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We ran into this issue where some MITM proxy adds The test I added fails before and passes after. |
elithrar
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Aug 20, 2020
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elithrar
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elithrar
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Thanks for this fix, and for including the relevant part of the RFCs.
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The values of the
UpgradeandConnectionresponse headers cancontain multiple tokens, for example
The WebSocket RFC describes the checking of these as follows:
It is careful to note "contains a value", "contains a token".
Previously, the client would reject with "bad handshake" if the header
doesn't contain exactly the value it looks for.
Change the checks to use
tokenListContainsValueinstead, which isincidentally what the server is already doing for similar checks.