[fix] startpage engine: properly display CAPTCHA if redirect page is seen (#5380)

Fixes an issue where startpage engine would display parsing error
(`json.decoder.JSONDecodeError`) when returning CAPTCHA redirect page.

The fix simply checks if response header has `Location` set, and if it starts
with `https://www.startpage.com/sp/captcha`, it will raise a CAPTCHA exception
before trying to parse the data.

1 files changed, 4 insertions, 0 deletions

diff --git a/searx/engines/startpage.py b/searx/engines/startpage.py
index adffa4109..cfa5de331 100644
--- a/searx/engines/startpage.py
+++ b/searx/engines/startpage.py
@@ -404,6 +404,10 @@ def _get_image_result(result) -> dict[str, t.Any] | None:
 def response(resp):
     categ = startpage_categ.capitalize()
     results_raw = '{' + extr(resp.text, f"React.createElement(UIStartpage.AppSerp{categ}, {{", '}})') + '}}'
+
+    if resp.headers.get('Location', '').startswith("https://www.startpage.com/sp/captcha"):
+        raise SearxEngineCaptchaException()
+
     results_json = loads(results_raw)
     results_obj = results_json.get('render', {}).get('presenter', {}).get('regions', {})