Method parseTransferEncoding

transfer.go:566–591

parseTransferEncoding sets t.Chunked based on the Transfer-Encoding header.

()

// parseTransferEncoding sets t.Chunked based on the Transfer-Encoding header.
func (t *transferReader) parseTransferEncoding() error {
	raw, present := t.Header["Transfer-Encoding"]
	if !present {
		return nil
	}
	delete(t.Header, "Transfer-Encoding")

	// Issue 12785; ignore Transfer-Encoding on HTTP/1.0 requests.
	if !t.protoAtLeast(1, 1) {
		return nil
	}

	// Like nginx, we only support a single Transfer-Encoding header field, and
	// only if set to "chunked". This is one of the most security sensitive
	// surfaces in HTTP/1.1 due to the risk of request smuggling, so we keep it
	// strict and simple.
	if len(raw) != 1 {
		return &unsupportedTEError{fmt.Sprintf("too many transfer encodings: %q", raw)}
	}
	if !ascii.EqualFold(raw[0], "chunked") {
		return &unsupportedTEError{fmt.Sprintf("unsupported transfer encoding: %q", raw[0])}
	}

	t.Chunked = true
	return nil
}

// Determine the expected body length, using RFC 7230 Section 3.3. This
// function is not a method, because ultimately it should be shared by