StreamingMultipartWriterAsyncSequence

struct StreamingMultipartWriterAsyncSequence<OutboundBody, BackingSequence, BackingBody> where OutboundBody : RangeReplaceableCollection, OutboundBody : Sendable, BackingSequence : AsyncSequence, BackingBody : RangeReplaceableCollection, BackingBody : Sendable, OutboundBody.Element == UInt8, BackingSequence.Element == MultipartSection<BackingBody>, BackingBody.Element == UInt8

Overview

This streaming writer processes multipart sections on-demand, making it memory-efficient for large multipart messages. It’s particularly useful when working with file uploads or when you need to stream multipart data without buffering the entire message in memory.

let sections: [MultipartSection<ArraySlice<UInt8>>] = [
    .headerFields([.contentType: "text/plain"]),
    .bodyChunk(ArraySlice("Hello, world!".utf8)),
    .boundary(end: true)
]

let writer = StreamingMultipartWriterAsyncSequence(
    backingSequence: sections.async,
    boundary: "boundary123"
)

for try await chunk in writer {
    // Process each serialized chunk
}