Method writeHeader

transfer.go:249–295

(writeHeader func(key string, values ...string) error)

}

func (t *transferWriter) writeHeader(writeHeader func(key string, values ...string) error) error {
	if t.Close && !hasToken(headerGet(t.Header, "Connection"), "close") {
		err := writeHeader("Connection", "close")
		if err != nil {
			return err
		}
	}

	// Write Content-Length and/or Transfer-Encoding whose values are a
	// function of the sanitized field triple (Body, ContentLength,
	// TransferEncoding)
	if t.shouldSendContentLength() {
		err := writeHeader("Content-Length", strconv.FormatInt(t.ContentLength, 10))
		if err != nil {
			return err
		}
	} else if chunked(t.TransferEncoding) {
		err := writeHeader("Transfer-Encoding", "chunked")
		if err != nil {
			return err
		}
	}

	// Write Trailer header
	if t.Trailer != nil {
		keys := make([]string, 0, len(t.Trailer))
		for k := range t.Trailer {
			k = http.CanonicalHeaderKey(k)
			switch k {
			case "Transfer-Encoding", "Trailer", "Content-Length":
				return badStringError("invalid Trailer key", k)
			}
			keys = append(keys, k)
		}
		if len(keys) > 0 {
			slices.Sort(keys)
			// TODO: could do better allocation-wise here, but trailers are rare,
			// so being lazy for now.
			err := writeHeader("Trailer", strings.Join(keys, ","))
			if err != nil {
				return err
			}
		}
	}

	return nil
}

// always closes t.BodyCloser
func (t *transferWriter) writeBody(w io.Writer, dumps []*dump.Dumper) (err error) {