HTTP access through Node's native fetch, with the existing post, put, del, get, stream and streamMany interface. No Request or merge-stream dependency.

JSON writes accept body; their response bodies are parsed when valid JSON. GET/DELETE and multipart responses retain text bodies. Every ordinary response has headers, statusCode, statusMessage and body, including HTTP errors. Repeated Set-Cookie headers remain an array. Native fetch decodes supported compression, so metadata removes the stale Content-Encoding/Content-Length for those decoded representations. formData accepts scalar fields, Buffers, Blobs and {value, options} fields with filename and contentType. Unopened path-backed file streams use native file-backed Blobs; already-open, descriptor-backed and other multipart streams are buffered with cancellation. Multipart buffering has no byte limit. For large files, pass a file-backed Blob from node:fs's openAsBlob to avoid buffering. File-stream byte ranges and existing descriptors are respected. Passing formData hands its Node input streams to the adapter: they are consumed during preparation or destroyed on failure/cancellation, including a signal that was already aborted. Successfully consumed streams with autoClose:false retain caller ownership of their descriptor. Use one of body and formData.

All methods accept signal and timeout in milliseconds, default 30 seconds per multipart-preparation phase, upload/response-header wait, and response-chunk wait. Upload progress does not reset the upload/headers deadline. Streams await each callback before reading again, reject HTTP errors before callbacks, abort on callback failure/cancellation and optionally call onResponseFn({headers,statusCode,statusMessage}) before data. A slow callback does not consume the network idle timeout. Callers own retries; mutating requests are never retried automatically.

GET redirects follow at most five hops. Authorization, Cookie and Proxy-Authorization are stripped when origin changes; HTTPS downgrade redirects are rejected. Writes return redirect responses without following them.

streamMany(requests, fn, sortFn, options) merges sorted input streams using one lookahead value per source and one awaited output callback. Inputs must already be sorted according to sortFn; it cannot sort arbitrary whole streams. An empty request list completes without callbacks. Failure cancels all sources. The optional decode factory returns a per-source {write,end} decoder so framed records can be decoded before comparing/merging, without sharing parser state between sources. Without a decoder, values remain raw byte chunks.

jsonDecoder() creates independent UTF-8 framing state for consecutive JSON objects/arrays. Feed chunks with write(chunk) and flush with end(). Quoted braces, nesting, escapes and byte-split code points are retained. Invalid UTF-8 bytes, malformed JSON, non-JSON separators and truncated final records reject the stream. Direct string chunks retain their UTF-16 characters across splits. The decoder buffers an incomplete record without a byte cap. Raw HTTP streams are not implicitly parsed; generic RPC explicitly opts in, with independent state for every HTTP execution, including retries and concurrent executions.