internationalization - RFC2616 algorithm for default content using Accept-Language header -

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i'm designing web service has content stored in database, , want ensure design compliant rfc2616. however, i'm little unclear on correct way match content.

if specify behaviour user story:

given request content in 'en_gb' when server has content in 'en_us'       , server has content in 'en_ca'      , server not have content in 'en' server should return content in '???'

question: language should server return content in?

update: based on pawel-dyda's answer, believe stories should this:

given request content in 'en_gb' when server has content in 'en_us'       , server has content in 'en_ca'      , server has content in 'en' server should return content in 'en'  given request content in 'en_gb' when server has content in 'en_us'       , server has content in 'en_ca'      , server not have content in 'en' server should return content in server default language

what want locale fallback. http accept-language header i18n best practice rules are:

  1. given lang-country pair return contents if available
  2. then try return content given language, if available
  3. then try next language on list (start 1)
  4. if nothing works far, return (application | server) default language.

for example, assuming application contains german translation (de) , http accept-language header looks like:

accept-language: fr-fr, de-at;q=0.7

the language returned should german (de).

going question, should return default locale. , have common resources given language (en in case).


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