An implementation of HPACK (Header Compression for HTTP/2). Based on rfc7541.
This lib is used by https://github.com/nitely/nim-hyperx
Nim +2
nimble install hpack
import hpack
proc toBytes(s: seq[uint16]): seq[byte] =
result = newSeqOfCap[byte](s.len * 2)
for b in s:
result.add(byte(b shr 8))
result.add(byte(b and 0xff))
# First request
let req1 = @[
0x8286'u16, 0x8441, 0x8cf1, 0xe3c2,
0xe5f2, 0x3a6b, 0xa0ab, 0x90f4].toBytes
var ss = ""
var bb = newSeq[HBounds]()
var dh = initDynHeaders(256)
assert hdecodeAll(req1, dh, ss, bb) == req1.len
assert(ss ==
":method: GET\r\L" &
":scheme: http\r\L" &
":path: /\r\L" &
":authority: www.example.com\r\L")
# Second request
let req2 = @[
0x8286'u16, 0x84be, 0x5886,
0xa8eb, 0x1064, 0x9cbf].toBytes
ss.setLen 0
bb.setLen 0
assert hdecodeAll(req2, dh, ss, bb) == req2.len
assert(ss ==
":method: GET\r\L" &
":scheme: http\r\L" &
":path: /\r\L" &
":authority: www.example.com\r\L" &
"cache-control: no-cache\r\L")
# So on...
import hpack
proc toBytes(s: seq[uint16]): seq[byte] =
result = newSeqOfCap[byte](s.len * 2)
for b in s:
result.add(byte(b shr 8))
result.add(byte(b and 0xff))
# First response
var resp = newSeq[byte]()
var dh = initDynHeaders(256)
hencode(":method", "GET", dh, resp)
hencode(":scheme", "http", dh, resp)
hencode(":path", "/", dh, resp)
hencode(":authority", "www.example.com", dh, resp)
assert resp == @[
0x8286'u16, 0x8441, 0x8cf1, 0xe3c2,
0xe5f2, 0x3a6b, 0xa0ab, 0x90f4].toBytes
# Second response
resp.setLen(0)
hencode(":method", "GET", dh, resp)
hencode(":scheme", "http", dh, resp)
hencode(":path", "/", dh, resp)
hencode(":authority", "www.example.com", dh, resp)
hencode("cache-control", "no-cache", dh, resp)
assert resp == @[
0x8286'u16, 0x84be, 0x5886,
0xa8eb, 0x1064, 0x9cbf].toBytes
# So on...
nimble test
MIT