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HTTP GRIP library for .NET
==========================

This library implements the Generic Realtime Intermediary Protocol (GRIP), used by Pushpin and Fanout.io to deliver realtime pushes to HTTP clients.

Background
----------

* Concept: http://blog.fanout.io/2013/02/10/http-grip-proxy-hold-technique/
* Implementation: http://blog.fanout.io/2013/04/09/an-http-reverse-proxy-for-realtime/
* Spec: https://fanout.io/docs/protocols.html#generic-realtime-intermediary-protocol-grip

Usage
-----

To subscribe an incoming HTTP request to a channel:

```c#
using System.Text;
using System.Net.Http;

public HttpResponseMessage Get()
{
  var instruct = new RealCrowd.Grip.Instruct();
  instruct.CreateResponseHold(
    "test-channel", // channel to subscribe to
    null,           // id of previous publish (optional)
    "text/plain",   // timeout content type
    "(no data)\n"); // timeout body
  var response = new HttpResponseMessage(HttpStatusCode.OK);
  response.Content = new StringContent(instruct.ToString(), Encoding.UTF8,
    "application/grip-instruct");
  return response;
}
```

To publish an HTTP response on a channel:

```c#
using System.Net.Http;

var publishControl = new RealCrowd.Grip.GripPublishControl("http://localhost:5561");
var responseFormat = new HttpResponseFormat(
  "text/plain",     // publish content type
  "hello world\n"); // publish body
await publishControl.PublishAsync(
  "test-channel",   // channel to publish on
  null,             // id of publish (optional)
  null,             // id of previous publish (optional)
  responseFormat);
```

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