haproxy : Checking for a single header

Question

My server is distributing websocket client connections over 4 local websocket servers.

Is it possible to instruct haProxy to accept only WebSocket version 13 (RFC 6455) ?

i.e. Verify if Sec-WebSocket-Version: 13 is set

score 5 · Accepted Answer · answered Aug 11 '14 at 16:43

5

In your frontend section:

acl websocket13 hdr_val(Sec-WebSocket-Version) eq 13
use_backend my_backend if websocket13

The first line says that if the header Sec-WebSocket-Version equals 13, then set a flag called websocket13. The second line says to use the backend section my_backend if the websocket13 flag is set.

answered Aug 11 '14 at 16:43

longneck

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and is it possible to use 'AND' operator? if websocket13 and somethingElse – Jack Aug 12 '14 at 13:22
Yes, it's pretty clearly explained on the manual page for use_backend. Have you looked? – longneck Aug 12 '14 at 13:23
Yes, I did, but found nothing except this -> eq ge gt le lt : – Jack Aug 23 '14 at 13:15
@Jack yes, absolutely, just put `&&`, you can check this for any other multiple conditions: https://serverfault.com/questions/768575/haproxy-acl-multiple-or-conditions – Alexey Strizhak Jun 01 '20 at 13:11
ops, sorry, need to put this: `if condition_1 condition2` – Alexey Strizhak Jun 01 '20 at 13:29

haproxy : Checking for a single header

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