example = [0, 0, 3, 212, 0, 0, 0, 103, 76, 21, 128, 165, 15, 58, 101, 120, 99, 101, 112, 116, 105, 111, 110, 45, 116, 121, 112, 101, 7, 0, 25, 73, 110, 118, 97, 108, 105, 100, 83, 105, 103, 110, 97, 116, 117, 114, 101, 69, 120, 99, 101, 112, 116,
105, 111, 110, 13, 58, 99, 111, 110, 116, 101, 110, 116, 45, 116, 121, 112, 101, 7, 0, 16, 97, 112, 112, 108, 105, 99, 97, 116, 105, 111, 110, 47, 106, 115, 111, 110, 13, 58, 109, 101, 115, 115, 97, 103, 101, 45, 116, 121, 112, 101, 7, 0, 9, 101,
120, 99, 101, 112, 116, 105, 111, 110, 123, 34, 77, 101, 115, 115, 97, 103, 101, 34, 58, 34, 84, 104, 101, 32, 114, 101, 113, 117, 101, 115, 116, 32, 115, 105, 103, 110, 97, 116, 117, 114, 101, 32, 119, 101, 32, 99, 97, 108, 99, 117, 108, 97, 116,
101, 100, 32, 100, 111, 101, 115, 32, 110, 111, 116, 32, 109, 97, 116, 99, 104, 32, 116, 104, 101, 32, 115, 105, 103, 110, 97, 116, 117, 114, 101, 32, 121, 111, 117, 32, 112, 114, 111, 118, 105, 100, 101, 100, 46, 32, 67, 104, 101, 99, 107, 32,
121, 111, 117, 114, 32, 65, 87, 83, 32, 83, 101, 99, 114, 101, 116, 32, 65, 99, 99, 101, 115, 115, 32, 75, 101, 121, 32, 97, 110, 100, 32, 115, 105, 103, 110, 105, 110, 103, 32, 109, 101, 116, 104, 111, 100, 46, 32, 67, 111, 110, 115, 117, 108,
116, 32, 116, 104, 101, 32, 115, 101, 114, 118, 105, 99, 101, 32, 100, 111, 99, 117, 109, 101, 110, 116, 97, 116, 105, 111, 110, 32, 102, 111, 114, 32, 100, 101, 116, 97, 105, 108, 115, 46, 92, 110, 92, 110, 84, 104, 101, 32, 67, 97, 110, 111,
110, 105, 99, 97, 108, 32, 83, 116, 114, 105, 110, 103, 32, 102, 111, 114, 32, 116, 104, 105, 115, 32, 114, 101, 113, 117, 101, 115, 116, 32, 115, 104, 111, 117, 108, 100, 32, 104, 97, 118, 101, 32, 98, 101, 101, 110, 92, 110, 39, 71, 69, 84, 92,
110, 47, 115, 116, 114, 101, 97, 109, 45, 116, 114, 97, 110, 115, 99, 114, 105, 112, 116, 105, 111, 110, 45, 119, 101, 98, 115, 111, 99, 107, 101, 116, 92, 110, 88, 45, 65, 109, 122, 45, 65, 108, 103, 111, 114, 105, 116, 104, 109, 61, 65, 87, 83,
52, 45, 72, 77, 65, 67, 45, 83, 72, 65, 50, 53, 54, 38, 88, 45, 65, 109, 122, 45, 67, 114, 101, 100, 101, 110, 116, 105, 97, 108, 61, 65, 75, 73, 65, 84, 52, 55, 65, 90, 72, 82, 81, 79, 82, 88, 72, 77, 85, 77, 79, 37, 50, 70, 50, 48, 50, 49, 48,
52, 49, 48, 37, 50, 70, 117, 115, 45, 101, 97, 115, 116, 45, 50, 37, 50, 70, 116, 114, 97, 110, 115, 99, 114, 105, 98, 101, 37, 50, 70, 97, 119, 115, 52, 95, 114, 101, 113, 117, 101, 115, 116, 38, 88, 45, 65, 109, 122, 45, 68, 97, 116, 101, 61,
50, 48, 50, 49, 48, 52, 49, 48, 84, 49, 56, 48, 50, 52, 57, 90, 38, 88, 45, 65, 109, 122, 45, 69, 120, 112, 105, 114, 101, 115, 61, 56, 54, 52, 48, 48, 38, 88, 45, 65, 109, 122, 45, 83, 105, 103, 110, 101, 100, 72, 101, 97, 100, 101, 114, 115, 61,
104, 111, 115, 116, 38, 108, 97, 110, 103, 117, 97, 103, 101, 45, 99, 111, 100, 101, 61, 101, 110, 45, 85, 83, 38, 109, 101, 100, 105, 97, 45, 101, 110, 99, 111, 100, 105, 110, 103, 61, 112, 99, 109, 38, 115, 97, 109, 112, 108, 101, 45, 114, 97,
116, 101, 61, 49, 54, 48, 48, 48, 92, 110, 104, 111, 115, 116, 58, 116, 114, 97, 110, 115, 99, 114, 105, 98, 101, 115, 116, 114, 101, 97, 109, 105, 110, 103, 46, 117, 115, 45, 101, 97, 115, 116, 45, 50, 46, 97, 109, 97, 122, 111, 110, 97, 119,
115, 46, 99, 111, 109, 58, 56, 52, 52, 51, 92, 110, 92, 110, 104, 111, 115, 116, 92, 110, 101, 51, 98, 48, 99, 52, 52, 50, 57, 56, 102, 99, 49, 99, 49, 52, 57, 97, 102, 98, 102, 52, 99, 56, 57, 57, 54, 102, 98, 57, 50, 52, 50, 55, 97, 101, 52, 49,
101, 52, 54, 52, 57, 98, 57, 51, 52, 99, 97, 52, 57, 53, 57, 57, 49, 98, 55, 56, 53, 50, 98, 56, 53, 53, 39, 92, 110, 92, 110, 84, 104, 101, 32, 83, 116, 114, 105, 110, 103, 45, 116, 111, 45, 83, 105, 103, 110, 32, 115, 104, 111, 117, 108, 100, 32,
104, 97, 118, 101, 32, 98, 101, 101, 110, 92, 110, 39, 65, 87, 83, 52, 45, 72, 77, 65, 67, 45, 83, 72, 65, 50, 53, 54, 92, 110, 50, 48, 50, 49, 48, 52, 49, 48, 84, 49, 56, 48, 50, 52, 57, 90, 92, 110, 50, 48, 50, 49, 48, 52, 49, 48, 47, 117, 115,
45, 101, 97, 115, 116, 45, 50, 47, 116, 114, 97, 110, 115, 99, 114, 105, 98, 101, 47, 97, 119, 115, 52, 95, 114, 101, 113, 117, 101, 115, 116, 92, 110, 52, 57, 54, 98, 50, 57, 49, 57, 54, 100, 100, 101, 98, 100, 57, 55, 101, 53, 100, 56, 54, 56,
54, 98, 54, 54, 100, 97, 101, 102, 48, 97, 100, 98, 102, 56, 53, 49, 48, 54, 53, 54, 99, 53, 52, 102, 100, 99, 98, 98, 101, 101, 100, 98, 49, 50, 54, 101, 55, 100, 54, 51, 57, 99, 39, 92, 110, 34, 125, 25, 123, 100, 219]

data = bytes(example)
import struct

# Prelude
total_len, headers_len = struct.unpack(">II", data[:8])
# Skip CRC
data = data[12:]

left = headers_len
while left > 0:
    # Read each header part
    # Get the name
    name_len = data[0]
    data = data[1:]
    name = data[:name_len].decode("utf-8")
    data = data[name_len:]
    # Get the value type
    value_type = data[0]
    data = data[1:]
    # Get the value
    value_len = struct.unpack(">H", data[:2])[0]
    data = data[2:]
    value = data[:value_len]
    data = data[value_len:]
    if value_type == 7:
        # Decode string headers
        value = value.decode("utf-8")

    left -= (4 + name_len + value_len)
    # And just print out the header key/values
    print(f"'{name}' = '{value}'")

# And if there's anything left, print it out, ignoring the trailing CRC
print(data[:-4])

# Outputs:
# ':exception-type' = 'InvalidSignatureException'
# ':content-type' = 'application/json'
# ':message-type' = 'exception'
# b'{"Message":"The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details.\\n\\nThe Canonical String for this request should have been\\n\'GET\\n/stream-transcription-websocket\\nX-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAT47AZHRQORXHMUMO%2F20210410%2Fus-east-2%2Ftranscribe%2Faws4_request&X-Amz-Date=20210410T180249Z&X-Amz-Expires=86400&X-Amz-SignedHeaders=host&language-code=en-US&media-encoding=pcm&sample-rate=16000\\nhost:transcribestreaming.us-east-2.amazonaws.com:8443\\n\\nhost\\ne3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855\'\\n\\nThe String-to-Sign should have been\\n\'AWS4-HMAC-SHA256\\n20210410T180249Z\\n20210410/us-east-2/transcribe/aws4_request\\n496b29196ddebd97e5d8686b66daef0adbf8510656c54fdcbbeedb126e7d639c\'\\n"}'