Request headers may potentially not have a proper ending (`\r\n\r\n`).

[webcarrot]

Bug Description

It's possible that proper ending of request headers (\r\n\r\n) will be not send immediately together with headers chunk due to:

👉🏻 https://github.com/nodejs/undici/blob/main/lib/client.js#L1677

socket.write(`${header}transfer-encoding: chunked\r\n`, 'ascii')

Potential fix:

    if (bytesWritten === 0) {
      if (!expectsPayload) {
        socket[kReset] = true
      }

      if (contentLength === null) {
        socket.write(`${header}transfer-encoding: chunked\r\n\r\n`, 'ascii')
        socket.write(`${len.toString(16)}\r\n`, 'ascii')
      } else {
        socket.write(`${header}content-length: ${contentLength}\r\n\r\n`, 'ascii')
      }

    } else if (contentLength === null) {
        socket.write(`\r\n${len.toString(16)}\r\n`, 'ascii')
    }

Reproducible By

It's quite random and depends on Socket/system behaviours - "Sometimes" 😉

👀 👉🏻 Additional context

Expected Behavior

Chunk containing request headers always contains proper headers ending - \r\n\r\n.

Additional context

Related issue: uNetworking/uWebSockets.js#879

In this issue I have tried to emulate behaviour of undici - especially: uNetworking/uWebSockets.js#879 (comment)

[ronag]

undici does the right thing here, but I guess it wouldn't hurt to send them at the same time.