2.2.6.6 If-None-Match

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The syntax of the If-None-Match header MUST adhere to the ABNF syntax specified in [RFC2616] section 14.26, with the following modification: The maximum number of entity-tag fields is 32.

These rules can be expressed using the following ABNF syntax:

           If-None-Match    = "If-None-Match: " 
                               ( "*" | 1*32#entity-tag ); defined in [RFC2616] section 3.11