request.Write: Accept an io.Writer

client.go

@@ -1,7 +1,6 @@
 package gemini
 
 import (
-	"bufio"
 	"context"
 	"crypto/tls"
 	"crypto/x509"
@@ -157,9 +156,7 @@ func (c *Client) Do(req *Request) (*Response, error) {
 
 func (c *Client) do(conn *tls.Conn, req *Request) (*Response, error) {
 	// Write the request
-	w := bufio.NewWriter(conn)
-
-	err := req.Write(w)
+	err := req.Write(conn)
 	if err != nil {
 		return nil, fmt.Errorf("failed to write request: %w", err)
 	}

request.go

@@ -107,16 +107,17 @@ func ReadRequest(r io.Reader) (*Request, error) {
 
 // Write writes a Gemini request in wire format.
 // This method consults the request URL only.
-func (r *Request) Write(w *bufio.Writer) error {
+func (r *Request) Write(w io.Writer) error {
+	bw := bufio.NewWriterSize(w, 1026)
 	url := r.URL.String()
 	if len(url) > 1024 {
 		return ErrInvalidRequest
 	}
-	if _, err := w.WriteString(url); err != nil {
+	if _, err := bw.WriteString(url); err != nil {
 		return err
 	}
-	if _, err := w.Write(crlf); err != nil {
+	if _, err := bw.Write(crlf); err != nil {
 		return err
 	}
-	return w.Flush()
+	return bw.Flush()
 }