Fix Anthropic Streaming Responses#479
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ericdallo merged 1 commit intoMay 30, 2026
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Anthropic gzip-compresses the streaming response by default. Decompression buffers the SSE body until a full deflate block arrives, so the whole reply effectively lands at the end instead of streaming incrementally. Send "accept-encoding: identity" so the event stream stays uncompressed, and set hato's :decompress-body false so the default middleware doesn't re-add "gzip, deflate" or try to decompress. Together they let the SSE stream be read line-by-line and surfaced token-by-token in the UI.
ericdallo
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May 30, 2026
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Interesting, thanks for that!
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Problem
Anthropic streaming responses arrive all at once at the end instead of
token-by-token. Anthropic gzip-compresses the SSE body and
hatodecompressesit, but
GZIPInputStreamonly emits bytes once a full deflate block arrives,so the stream is buffered until the response is nearly complete.
Fix
Send
accept-encoding: identityand set hato's:decompress-body falseso the event-stream stays uncompressed and can be readline-by-line.
Tradeoff
SSE text is no longer gzipped, but for interactive use it's negligible and time-to-first-token improves.
Server-side chunk granularity is unchanged.