问题
I'm working on SEO for a Rails App.
The website is fully localized, and I'm following this google article to add hreflang alternate links to the pages.
The HTML links in the <head> are ok.
I'm having some troubles with the response headers.
I understand that I'm supposed to provide values for each alternative version of the page, but I'm not sure about how to set multiple values.
I tried to pass them as a comma separated list. Browsers seem to receive it correctly, but since individual values contain semi-colons it looks wrong.
Is there any reference on it? Even an example webpage that is known to implement it correctly would help.
回答1:
I have no experience with this, but according to the examples in the same RFC they get separated by comma:
Link: </TheBook/chapter2>;
rel="previous"; title*=UTF-8'de'letztes%20Kapitel,
</TheBook/chapter4>;
rel="next"; title*=UTF-8'de'n%c3%a4chstes%20Kapitel
It’s indirectly confirmed by 5.3 (emphasis mine):
Note that extension relation types are REQUIRED to be absolute URIs in Link headers, and MUST be quoted if they contain a semicolon (";") or comma (",") (as these characters are used as delimiters in the header itself).
来源：https://stackoverflow.com/questions/25369191/http-response-headers-multiple-link-values