zappa / Zappa / 35287688197
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:bug: Use rawQueryString for API Gateway v2 to preserve repeated query params (#1473)

API Gateway payload format 2.0 has no multiValueQueryStringParameters and
flattens repeated parameters into a comma-joined value in
queryStringParameters (?id=1&id=2 => {"id": "1,2"}).
process_lambda_payload_v2 read that lossy field, so applications saw a
single value "1,2" instead of two, breaking anything relying on repeated
parameters (Wagtail choosers, request.GET.getlist, django-filter, DRF).

Build QUERY_STRING from rawQueryString instead, which API Gateway delivers
verbatim and already percent-encoded, so it is passed through without
urlencode (double-escaping) or unquote (which would destroy a literal &
or = inside a value). This also preserves a literal comma in a single
value, which queryStringParameters cannot express.

The presence check is "rawQueryString" in event_info rather than
truthiness, so an empty query string does not fall through to the legacy
path. Invokers other than API Gateway may send a v2-shaped event with no
rawQueryString; that fallback now uses doseq=True to match the v1
multi-value branch.

zappa/asgi.py calls the same function, so ASGI apps are fixed too, as are
Lambda Function URLs, which use payload format 2.0 regardless of the
apigateway_version setting. v1 (REST API) and ALB are unchanged.

This was invisible to the suite because every v2 fixture used
"rawQueryString": "" and the only v2 QUERY_STRING assertion checked for
"". Adds regression tests at the WSGI, ASGI and handler levels.

Closes #1472

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
Co-authored-by: monkut <shane.cousins@gmail.com>

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Jobs
ID Job ID Ran Files Coverage
1 py3.11 - 35287688197.1 14
74.75
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2 py3.13 - 35287688197.2 14
74.75
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3 py3.10 - 35287688197.3 14
74.75
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4 py3.12 - 35287688197.4 14
74.75
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5 py3.14 - 35287688197.5 14
74.75
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6 py3.9 - 35287688197.6 14
74.75
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Source Files on build 35287688197