Values should be semicolon-delimited.
RFC2616, section 4.2 specifies that HTTP headers appearing multiple times can be combined with a comma. Both WebKit and Mozilla respect this, which means that commas ought to be avoided in the text of the header's value. This patch suggests a semicolon as a reasonable alternative.
|@@ -71,7 +71,7 @@ The "Client-Hints" Request Header Field|
|The "Client-Hints" request header field describes the current client preferences that the server can use to adapt and optimize the resource to satisfy a given request.|
|-The Client-Hints field-value is a comma-delimited list of header fields. The field-name values are case insensitive.|
|+The Client-Hints field-value is a semicolon-delimited list of header fields. The field-name values are case insensitive.|
|Client-Hints Header Fields|