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Back-end modules shall read the HTTP Accept-Language header, as specified in RFC-7231 Section 5.3.5, to determine the desired locale of the response.

• Back-end modules shall read the HTTP Accept-Language header, as specified in RFC-7231 Section 5.3.5, to determine the desired locale of the response.
  • The value is case insensitive (e.g. de and DE are equivalent).
  • Multiple values may be present in a comma-separated list.
    • Values may use weights in the range 0-1 appended to each value to indicate preference.
    • Values without a weight shall be considered 1.0.
    • Values with equal weights shall be considered to be ranked in descending order of preference.
    • e.g. de, en-gb;q=0.8, en;q=0.7
  • Values may optionally include subtags (e.g. de-DE). 
• The default value en-US will be used when a request lacks an Accept-Language header.
• Unspecified functionality should follow established precedent, e.g RFC-4646 (tags for identifying languages), RFC-7231 (HTTP Accept-Language header), ISO 639-1 (two-letter language codes), etc.

Implications

• Pros
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• Cons
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