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server: fix SSE and OpenAI compatibility for error messages when streaming#16109

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ngxson merged 2 commits intoggml-org:masterfrom
BenjaminBruenau:fix/server/sse-spec-error-messages-compatibility
Sep 20, 2025
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server: fix SSE and OpenAI compatibility for error messages when streaming#16109
ngxson merged 2 commits intoggml-org:masterfrom
BenjaminBruenau:fix/server/sse-spec-error-messages-compatibility

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@BenjaminBruenau
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This fixes compatibility with the SSE specification by not sending error messages out with an incompatible fieldname.
Therefore this also ensures proper exceptions when working for example with OpenAI client libraries, instead of being handled as an empty message.

Closes:
#16104

Comment thread tools/server/server.cpp Outdated
}
}, [&](const json & error_data) {
server_sent_event(sink, "error", error_data);
server_sent_event(sink, "data", json{{"error", error_data}});
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Seems like we no longer need the second argument of server_sent_event, as it will always be "data"

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Yeah that makes sense.
Should this be kept in a way to make it compatible with the actual event field of the SSE spec (in a line above the data - if specified) or should that parameter be completely removed and simply always only use the data line?
e.g.

event: error
data: {error: {....}}

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I think most parsers will accept format data: {error: {....}}, anything outside of that always caused problems for downstream in the past, like the data: [DONE] for example.

@ngxson
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ngxson commented Sep 20, 2025

cc @allozaur you may need to update web ui code too (not urgent)

@ngxson ngxson merged commit 459c0c2 into ggml-org:master Sep 20, 2025
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struct pushed a commit to struct/llama.cpp that referenced this pull request Sep 26, 2025
…aming (ggml-org#16109)

* server: fix SSE and OpenAI compatibility for error messages when streaming

* server: remove obsolete event parameter and use required data fieldname instead
pwilkin pushed a commit to pwilkin/llama.cpp that referenced this pull request Oct 23, 2025
…aming (ggml-org#16109)

* server: fix SSE and OpenAI compatibility for error messages when streaming

* server: remove obsolete event parameter and use required data fieldname instead
blime4 referenced this pull request in blime4/llama.cpp Feb 5, 2026
…aming (#16109)

* server: fix SSE and OpenAI compatibility for error messages when streaming

* server: remove obsolete event parameter and use required data fieldname instead
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3 participants