"application/vnd.unity",
				"application/vnd.uoml+xml",
				"application/vnd.uplanet.alert",
				"application/vnd.uplanet.alert-wbxml",
				"application/vnd.uplanet.bearer-choice",
				"application/vnd.uplanet.bearer-choice-wbxml",
				"application/vnd.uplanet.cacheop",
				"application/vnd.uplanet.cacheop-wbxml",
				"application/vnd.uplanet.channel",
				"application/vnd.uplanet.channel-wbxml",

	total := serverPools.TotalAvailable()
	if total == 0 {
		return -1
	}
	// choose when we reach this many
	choose := rand.Uint64() % total
	atTotal := uint64(0)
	for _, pool := range serverPools {
		atTotal += pool.Available
		if atTotal > choose && pool.Available > 0 {
			return pool.Index
		}
	}
	// Should not happen, but print values just in case.

	letterIdxMax  = 63 / letterIdxBits   // # of letter indices fitting in 63 bits
)

// Random number state.
// We generate random temporary file names so that there's a good
// chance the file doesn't exist yet.
var (
	randN  uint32
	randmu sync.Mutex
)

// Temp files created in default Tmp dir
var globalTestTmpDir = os.TempDir()