node outgoing headers lowercase or uppercase

client.js

/*
 * Run tcpdump to capture outgoing HTTP headers first eg:
 * "sudo tcpdump -vs 1024 -l -A dst www.google.com" (might need -i <interface>)
 *
 */

var http = require('http')

var options = {
  hostname: 'www.google.com',
  port: 80,
  path: '/',
  method: 'GET',
  headers: {
    AuThoRiZaTiOn: 'VaLuE'
  }
}

var req = http.request(options, function(res) {
  console.log('STATUS: ' + res.statusCode)
  console.log('HEADERS: ' + JSON.stringify(res.headers))
  res.setEncoding('utf8')
  res.on('data', function (chunk) {
    console.log('BODY: ' + chunk)
  })
})

req.on('error', function(e) {
  console.log('problem with request: ' + e.message)
})

req.end()

node_versions

$ node -p -e "process.versions"
{ http_parser: '1.0',
  node: '0.8.11',
  v8: '3.11.10.22',
  ares: '1.7.5-DEV',
  uv: '0.8',
  zlib: '1.2.3',
  openssl: '1.0.0f' }

tcpdump-out.txt

tcpdump: listening on wlan0, link-type EN10MB (Ethernet), capture size 1024 bytes
03:32:50.421786 IP (tos 0x0, ttl 64, id 62783, offset 0, flags [DF], proto TCP (6), length 60)
    DANLAPTOP.local.56287 > muc03s01-in-f19.1e100.net.http: Flags [S], cksum 0x9330 (incorrect -> 0x56e3), seq 1391342967, win 14600, options [mss 1460,sackOK,TS val 3719240 ecr 0,nop,wscale 4], length 0
E..<.?@[email protected]......#....PR.5w......9..0.........
.8.H........
03:32:50.512939 IP (tos 0x0, ttl 64, id 62784, offset 0, flags [DF], proto TCP (6), length 52)
    DANLAPTOP.local.56287 > muc03s01-in-f19.1e100.net.http: Flags [.], cksum 0x9328 (incorrect -> 0xec40), ack 3103798750, win 913, options [nop,nop,TS val 3719263 ecr 140957558], length 0
E..4.@@.@.........#....PR.5x..5......(.....
.8._.f.v
03:32:50.513473 IP (tos 0x0, ttl 64, id 62785, offset 0, flags [DF], proto TCP (6), length 138)
    DANLAPTOP.local.56287 > muc03s01-in-f19.1e100.net.http: Flags [P.], cksum 0x6bdd (correct), seq 0:86, ack 1, win 913, options [nop,nop,TS val 3719263 ecr 140957558], length 86
E....A@.@..*......#....PR.5x..5.....k......
.8._.f.vGET / HTTP/1.1
AuThoRiZaTiOn: VaLuE
Host: www.google.com
Connection: keep-alive


03:32:50.622628 IP (tos 0x0, ttl 64, id 62786, offset 0, flags [DF], proto TCP (6), length 52)
    DANLAPTOP.local.56287 > muc03s01-in-f19.1e100.net.http: Flags [.], cksum 0x9328 (incorrect -> 0xe713), ack 983, win 1036, options [nop,nop,TS val 3719290 ecr 140957665], length 0
E..4.B@.@.........#....PR.5...9......(.....
.8.z.f..
03:32:50.638029 IP (tos 0x0, ttl 64, id 62787, offset 0, flags [DF], proto TCP (6), length 52)
    DANLAPTOP.local.56287 > muc03s01-in-f19.1e100.net.http: Flags [F.], cksum 0x9328 (incorrect -> 0xe70e), seq 86, ack 983, win 1036, options [nop,nop,TS val 3719294 ecr 140957665], length 0
E..4.C@.@..~......#....PR.5...9......(.....
.8.~.f..
03:32:50.725486 IP (tos 0x0, ttl 64, id 62788, offset 0, flags [DF], proto TCP (6), length 52)
    DANLAPTOP.local.56287 > muc03s01-in-f19.1e100.net.http: Flags [.], cksum 0x9328 (incorrect -> 0xe68c), ack 984, win 1036, options [nop,nop,TS val 3719316 ecr 140957772], length 0
E..4.D@.@..}......#....PR.5...9......(.....
.8...f.L
^C
6 packets captured
7 packets received by filter
0 packets dropped by kernel