July 2025 monthly summary for envoyproxy/envoy. Focused on enhancing Wasm plugin configurability to improve runtime flexibility and data inspection capabilities. Key feature delivered: a new configuration setting allow_on_headers_stop_iteration in the Wasm plugin configuration. This setting controls how the Wasm filter handles the FilterHeadersStatus::StopIteration return value from onRequestHeaders and onResponseHeaders callbacks. By default, existing behavior remains unchanged, but when enabled, it allows Wasm plugins to pass StopIteration through directly, enabling inspection of request or response body data before header transformations. This change was implemented with commit 274d68f02971c1cf0da1628991126e8ebd307d25 (wasm: add config setting to control StopIteration behavior) as part of PR #40213. No major bugs fixed in this scope for July 2025. Overall impact includes greater plugin flexibility, improved extensibility of Wasm workflows, and continued alignment with Wasm ecosystem goals. Technologies/skills demonstrated: Wasm plugin framework, Envoy configuration model, Wasm/C++ integration, Git-based change tracing, and PR-driven development.

January 2025: Focused on maintaining test suite reliability for Wasm across evolving Emscripten versions; completed Wasm test compatibility update to support Emscripten 3.1.72+ and prevent CI test flakiness.