HttpMachine for .NET Standard 2.0

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Background

This is a fork of the great work done by Benjamin van der Veen. The Original HttpMachine

HttpMachine.PCL is a combined C# HTTP request/reponse parser. It implements a state machine with Adrian Thurston's excellent state machine compiler, Ragel. Because Ragel supports C#, Java, Ruby, C++ and more.

I've forked this project as Benjamin is no longer is maintaining the work.

Breaking changes for version 4.0+

.NET Standard 2.0+ is now required minimun version.

Refactoring and simplification of use, have caused some namespaces to change. See example below for guidance for usage.

For instance, while still possible, it's no longer necessary to implement the interface IHttpCombinedParser, instead simply new up the HttpParserDelegate. Methods can be overrided if needed.

Breaking changes from version 3.0.1 to 3.1.0

From version 3.1.0 and forward the ParserHandler must implement IHttpCombinedParser instead of using HttpCombinedParser (see example code below).

Original features

HTTP/1.1 and 1.0
Supports pipelined requests
Tells your server if it should keep-alive
Extracts the length of the entity body
Support for parsing responses and request in one combined parser.

Additional features

Additions to this version compared with the original HttpMachine by Benjamin van der Veen

.NET Standard 1.0 support (after version 4.0 only .NET Standard 2.0 is supported).
Support for Chunked Transfer-Encoding
Can be used on Windows 8+, .NET 4.5+, Xamarin.Android, Xamarin.iOS and ASP.NET Core 1.0+
The Http Method now accepts these additional four characters: $ - , .
From library ver 1.1.1 the parser has been combined into one Request/Reponse parser. Filter on MessageType to see what type was passed.
Can now manage Zero Lenght Headers - for example EXT: as used in UPnP.
From version 4.0 and onwards header values are collected in an IEnumerable<string>;

Use like this:

class Program
    {
        static void Main(string[] args)
        {
            byte[] bArray;

            using (var handler = new HttpParserDelegate())
            using (var parser = new HttpCombinedParser(handler))
            {
                bArray = TestReponse();
                Console.WriteLine(parser.Execute(bArray) == bArray.Length
                    ? $"Reponse test succeed. Type identified is; {handler.HttpRequestResponse.MessageType} \r\n" +
                        $"Headers: \r\n" +
                        $"{string.Join("\r\n", handler.HttpRequestResponse.Headers.Select(h => $"{h.Key}: {string.Join(", ", h.Value)} "))}"
                    : $"Response test failed");

                handler.HttpRequestResponse.Body.Position = 0;
                var reader = new StreamReader(handler.HttpRequestResponse.Body);
                var body = reader.ReadToEnd();
            }

            Console.WriteLine("\r\n\r\n");

            using (var handler = new HttpParserDelegate())
            using (var parser = new HttpCombinedParser(handler))
            {
                bArray = TestChunkedResponse();
                Console.WriteLine(parser.Execute(bArray) == bArray.Length
                    ? $"Chunked Response test succeed. Type identified is; {handler.HttpRequestResponse.MessageType}." +
                    $"Headers: \r\n" +
                    $"{string.Join("\r\n", handler.HttpRequestResponse.Headers.Select(h => $"{h.Key}: {string.Join(",", h.Value)} "))}"
                    : $"Chunked Response test failed");

                handler.HttpRequestResponse.Body.Position = 0;
                var reader = new StreamReader(handler.HttpRequestResponse.Body);
                var body = reader.ReadToEnd();
            }
        }
        
        // Test Response
        private static string TestReponse()
        {
            var stringBuilder = new StringBuilder();
            stringBuilder.Append("HTTP/1.1 200 OK\r\n");
            stringBuilder.Append("CACHE-CONTROL: max-age = 10\r\n");
            stringBuilder.Append("ST: upnp:rootdevice\r\n");
            stringBuilder.Append("ST: upnp:rootdevice\r\n");
            stringBuilder.Append("USN: uuid:73796E6F-6473-6D00-0000-0011322fe5f0::upnp:rootdevice\r\n");
            stringBuilder.Append("EXT:\r\n");
            stringBuilder.Append("SERVER: Synology/DSM/200.200.200.200\r\n");
            stringBuilder.Append("LOCATION: http://200.200.200.101:5000/ssdp/desc-DSM-eth1.xml\r\n");
            stringBuilder.Append("OPT: \"http://schemas.upnp.org/upnp/1/0/\"; ns=01\r\n");
            stringBuilder.Append("01-NLS: 1\r\n");
            stringBuilder.Append("BOOTID.UPNP.ORG: 1\r\n");
            stringBuilder.Append("CONFIGID.UPNP.ORG: 1337\r\n");
            stringBuilder.Append("\r\n");
            return stringBuilder.ToString();
        }
        
        // Test request
        private static string TestRequest()
        {
            var stringBuilder = new StringBuilder();
            stringBuilder.Append("NOTIFY * HTTP/1.1\r\n");
            stringBuilder.Append("HOST: 239.255.255.250:1900\r\n");
            stringBuilder.Append("CACHE-CONTROL: max-age = 10\r\n");
            stringBuilder.Append("LOCATION: http://www.bing.com\r\n");
            stringBuilder.Append("NT: \"upnp:rootdevice\"\r\n");
            stringBuilder.Append("NTS: ssdp:alive\r\n");
            stringBuilder.Append("EXT:\r\n");
            stringBuilder.Append("SERVER: Synology/DSM/200.200.200.100 UPnP/2.0 Test/1.0\r\n");
            stringBuilder.Append("BOOTID.UPNP.ORG: 1\r\n");
            stringBuilder.Append("CONFIGID.UPNP.ORG: 121212\r\n");
            stringBuilder.Append("\r\n");
            return stringBuilder.ToString();
        }
    }

1iveowl / HttpMachine.PCL