Support multipart form uploads in http_server source

[ryanartecona]

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Use Cases

I have a use case for Vector to proxy Pyroscope profile payloads from a client library to a Pyroscope destination. Some Pyroscope client libraries, namely including pyroscope-nodejs, send payloads as a multipart/form-data upload to the Pyroscope ingest API.

Attempted Solutions

It's currently possible, technically, to use a VRL remap to very crudely parse a multipart upload body with just string slicing, but it's difficult and brittle. I can provide code if it helps, but it probably shouldn't be used as a reference.

Proposal

It would be ideal to support multipart uploads natively in the http_server source.

References

• #21057

Version

0.40.0