gistfile1.go

package main

import (
	"bufio"
	"crypto/tls"
	"fmt"
	"log"
	"net/url"
	"strconv"
	"strings"
	"time"
)

func main() {
	u, err := url.Parse("https://www.heroku.com")
	if err != nil {
		log.Fatal(err)
	}

	ts := time.Now()
	// TODO grab name lookup time

	conn, err := tls.Dial("tcp", u.Host+":443", &tls.Config{})
	if err != nil {
		log.Fatal(err)
	}
	ttc := time.Now()

	fmt.Fprintf(
		conn,
		"GET %s HTTP/1.1\r\nHost: %s\r\n\r\n",
		u.RequestURI(),
		u.Host)

	b := make([]byte, 1)
	_, err = conn.Read(b)
	if err != nil {
		log.Fatal(err)
	}
	ttfb := time.Now()

	r := bufio.NewReader(conn)

	// TODO read the status?
	status, err := r.ReadString('\n')
	if err != nil {
		log.Fatal(err)
	}
	log.Print(string(b) + status)

	headers := make(map[string]string, 0)
	for {
		line, err := r.ReadString('\n')
		if err != nil {
			log.Fatal(err)
		}
		cleanLine := strings.TrimSpace(line)
		if cleanLine == "" {
			// end of headers
			break
		}

		parts := strings.SplitN(cleanLine, ": ", 2)
		headers[parts[0]] = parts[1]
	}

	if val, ok := headers["Content-Length"]; ok {
		contentLength, err := strconv.Atoi(val)
		if err != nil {
			log.Fatal(err)
		}
		n := 0
		buf := make([]byte, contentLength)
		for i := contentLength; i > 0; i = i - n {
			n, err = r.Read(buf)
		}
	}

	// close things down
	conn.Close()

	te := time.Now()
	fmt.Println(ttc.Sub(ts))
	fmt.Println(ttfb.Sub(ts))
	fmt.Println(te.Sub(ts))
}