Render readable Unicode in formatted JSON response body - #745
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The JSON formatter escaped every non ASCII character as \uXXXX because Utf8JsonWriter uses JavaScriptEncoder.Default. Switch to UnsafeRelaxedJsonEscaping and restore supplementary characters, which the encoder cannot allow list, through a surrogate pair aware pass. Control characters, quotes and backslashes remain escaped and the output stays valid JSON.
This was referenced Jul 27, 2026
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Fixes the escaping part of #740.
The JSON formatter escaped every non ASCII character as \uXXXX because Utf8JsonWriter uses JavaScriptEncoder.Default. Switch to UnsafeRelaxedJsonEscaping and restore supplementary characters, which the encoder cannot allow list, through a surrogate pair aware pass. Control characters, quotes and backslashes remain escaped and the output stays valid JSON.
Covered by new offline unit tests in ResponseBodyJsonFormattingTests.