MsgParser

// init parser
auto reqParser = initParser!Msg(); // or `MsgParser!MSG reqParser;`
auto resParser = initParser!Msg(); // or `MsgParser!MSG resParser;`

// parse request
string data = "GET /foo HTTP/1.1\r\nHost: 127.0.0.1:8090\r\n\r\n";
// returns parsed message header length when parsed sucessfully, -ParserError on error
int res = reqParser.parseRequest(data);
assert(res == data.length);
assert(reqParser.method == "GET");
assert(reqParser.uri == "/foo");
assert(reqParser.minorVer == 1); // HTTP/1.1
assert(reqParser.headers.length == 1);
assert(reqParser.headers[0].name == "Host");
assert(reqParser.headers[0].value == "127.0.0.1:8090");

// parse response
data = "HTTP/1.0 200 OK\r\n";
uint lastPos; // store last parsed position for next run
res = resParser.parseResponse(data, lastPos);
assert(res == -ParserError.partial); // no complete message header yet
data = "HTTP/1.0 200 OK\r\nContent-Type: text/plain\r\nContent-Length: 3\r\n\r\nfoo";
res = resParser.parseResponse(data, lastPos); // starts parsing from previous position
assert(res == data.length - 3); // whole message header parsed, body left to be handled based on actual header values
assert(resParser.minorVer == 0); // HTTP/1.0
assert(resParser.status == 200);
assert(resParser.statusMsg == "OK");
assert(resParser.headers.length == 2);
assert(resParser.headers[0].name == "Content-Type");
assert(resParser.headers[0].value == "text/plain");
assert(resParser.headers[1].name == "Content-Length");
assert(resParser.headers[1].value == "3");