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feature: Enlarge maxBodySize #737

Description

@esnible

Feature Description

maxBodySize is hard-coded to 1MB, Envoy's default per_stream_buffer_limit_bytes.

I can Claude through authbridge's forward proxy, and I see

time=2026-08-04T19:00:49.374Z level=INFO msg=inference-parser binary=authbridge-proxy model=claude-opus-5
time=2026-08-04T19:00:57.435Z level=WARN msg="forward-proxy: response body too large" binary=authbridge-proxy host=downloads.claude.ai len=1048577
time=2026-08-04T19:01:03.243Z level=WARN msg="forward-proxy: text/event-stream response with WritesBody plugin — falling back to buffered path" binary=authbridge-proxy host=ete-litellm.ai-models.vpc-int.res.ibm.com

in the logs. Note that I only asked Claude to test connection to get this large response.

Proposed Solution

Increase the default and add a config or env variable to override the default.

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