fix: parse Server-Sent Events in Agent Engine streaming responses - #7049
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Agent Engine streaming responses are newline-delimited JSON. A response may
instead arrive as Server-Sent Events, with each JSON object wrapped in a
`data:` frame. The streaming readers now remove that framing before parsing, so
both shapes yield the same parsed objects rather than raw `data: {...}`
strings, and the `HttpBody` reader parses a `text/event-stream` response rather
than yielding the unparsed message.
Newline-delimited JSON responses are unaffected.
PiperOrigin-RevId: 963665494
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fix: parse Server-Sent Events in Agent Engine streaming responses
Agent Engine streaming responses are newline-delimited JSON. A response may
instead arrive as Server-Sent Events, with each JSON object wrapped in a
data:frame. The streaming readers now remove that framing before parsing, soboth shapes yield the same parsed objects rather than raw
data: {...}strings, and the
HttpBodyreader parses atext/event-streamresponse ratherthan yielding the unparsed message.
Newline-delimited JSON responses are unaffected.