[mod] add 'Accept-Language' HTTP header to online processores

Most engines that support languages (and regions) use the Accept-Language from
the WEB browser to build a response that fits to the language (and region).

- add new engine option: send_accept_language_header

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

1 files changed, 8 insertions, 0 deletions

diff --git a/docs/admin/engines/settings.rst b/docs/admin/engines/settings.rst
index 0b4b984d7..f85c6a75f 100644
--- a/docs/admin/engines/settings.rst
+++ b/docs/admin/engines/settings.rst
@@ -440,6 +440,7 @@ engine is shown.  Most of the options have a default value or even are optional.
      engine: example
      shortcut: demo
      base_url: 'https://{language}.example.com/'
+     send_accept_language_header: false
      categories: general
      timeout: 3.0
      api_key: 'apikey'
@@ -488,6 +489,13 @@ engine is shown.  Most of the options have a default value or even are optional.
   use multiple sites using only one engine, or updating the site URL without
   touching at the code.
 
+``send_accept_language_header`` :
+  Several engines that support languages (or regions) deal with the HTTP header
+  ``Accept-Language`` to build a response that fits to the locale.  When this
+  option is activated, the language (locale) that is selected by the user is used
+  to build and send a ``Accept-Language`` header in the request to the origin
+  search engine.
+
 ``categories`` : optional
   Define in which categories this engine will be active.  Most of the time, it is
   defined in the code of the engine, but in a few cases it is useful, like when