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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.
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The HTTP Headers can have one or more values depending on the header field definitions. A multi-valued header will have comma separated values. Here are a few examples of headers that contain multiple values: Cache-Control: no-cache, no-store, must-revalidate.
A recipient MAY combine multiple header fields with the same field name into one field-name: field-value pair, without changing the semantics of the message, by appending each subsequent field value to the combined field value in order, separated by a comma.
Multi-value headers. If requests from a client or responses from a Lambda function contain headers with multiple values or contains the same header multiple times, or query parameters with multiple values for the same key, you can enable support for multi-value header syntax.
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).
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