[fix] duckduckgo lite engine: set HTTP header 'Referer'

Browse Source 
We have had problems with this before, the bot protection from ddg-lite seems to
have included this referer in the rating [1][2].

From reverse engineering:

- The Referer ``https://google.com/`` was set in commt 257dc7d6c4 --> DDG lite
  does not like this referer anymore!

- The 'Referer' header is only set on second and follow up pages but not on the
  first page

- The vqd value is not needed on the first page, the ddg-lite client sets this
  value only on follow up pages / this can help to reduce the vqd requests from
  SearXNG.

Related to 'Referer' header & ddg requests:

[1] https://github.com/searxng/searxng/pull/2161
[2] https://github.com/searxng/searxng/pull/2081

Closes: https://github.com/searxng/searxng/issues/2796
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
This commit is contained in:
Markus Heiser 2023-10-10 08:13:07 +02:00 committed by Markus Heiser
parent fa5b2a7948
commit 9197efa2a7
1 changed files with 4 additions and 1 deletions
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5
searx/engines/duckduckgo.py
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@ -222,7 +222,6 @@ def request(query, params):
# link again and again ..
params['headers']['Content-Type'] = 'application/x-www-form-urlencoded'
params['headers']['Referer'] = 'https://google.com/'
# initial page does not have an offset
if params['pageno'] == 2:
@ -248,6 +247,10 @@ def request(query, params):
params['data']['nextParams'] = form_data.get('nextParams', '')
params['data']['v'] = form_data.get('v', 'l')
# request needs a vqd argument
params['data']['vqd'] = get_vqd(query)
params['headers']['Referer'] = 'https://lite.duckduckgo.com/'
params['data']['kl'] = eng_region
params['cookies']['kl'] = eng_region