fix: allow multipart/form-data boundary to end with a newline #5660
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The RFC 7578 spec for multipart/form-data requests does not require the body of a request to end with a CRLF, only that each section begins with a CRLF. While many clients implement multipart requests with the trailing CRLF, the implementation for fetch in Node.js version 22 and below does not. This caused my a good number of hours debugging! It does turn out that in September 2024 the Node.js fetch implementation added the CRLF (nodejs/undici#3625), though this hasn't made it to a Node.js release yet. This change allows the boundary to end with a newline or not, as long as the boundary is followed by the end of the request body.
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CodSpeed Performance ReportMerging #5660 will improve performances by 32.73%Comparing Summary
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This required installing undici, which is the more frequently updated version of Node's built in fetch. This is because Langflow doesn't consider a multipart/form-data request that doesn't end with a CRLF to be a valid request and the current version of undici embedded in Node doesn't add the CRLF. I've made a PR to Langflow to relax this requirement (langflow-ai/langflow#5660), and version 7 of undici has been merged to the Node main branch but not yet released in any version, at the time of writing.
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The RFC 7578 spec for multipart/form-data requests does not require the body of a request to end with a CRLF, only that each section begins with a CRLF. While many clients implement multipart requests with the trailing CRLF, the implementation for fetch in Node.js version 22 and below does not.
This caused my a good number of hours debugging!
It does turn out that in September 2024 the Node.js fetch implementation added the CRLF, though this hasn't made it to a Node.js release yet.
This change allows the boundary to end with a CRLF or not, as long as the boundary is followed by the end of the request body.