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https://letsencrypt.org/about/

https://msdn.microsoft.com/en-us/library/ms229045(v=vs.110).aspx

AngleSharp is a .NET library that gives you the ability to parse angle bracket based hyper-texts like HTML, SVG, and MathML. XML without validation is also supported by the library. An important aspect of AngleSharp is that CSS can also be parsed. The parser is built upon the official W3C specification. This produces a perfectly portable HTML5 DOM representation of the given source code. Also current features such as querySelector or querySelectorAllwork for tree traversal.

https://github.com/AngleSharp/AngleSharp/

In WebApiConfig.cs file from App_Start folder and add the following code in the Register method –

config.EnableCors(); //if cross origin requests should be enabled
var json = config.Formatters.JsonFormatter;
json.SerializerSettings.PreserveReferencesHandling = Newtonsoft.Json.PreserveReferencesHandling.Objects;
json.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
config.Formatters.Remove(config.Formatters.XmlFormatter);

This code does the following:

1. Converts names of properties to camel case while serializing the objects to JSON

2. Removes XML formatter from Web API’s formatters to make sure JSON data is returned on each request

Use this code to easily return json formatted response from api controller:

var employees= EmployeesRepository.GetAllEmployees();
HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK, employees);
return response;

Example code for setting up controller and action with cors:

[EnableCors(origins: "http://localhost:55058", headers: "*", methods: "*")]
public classPTEmployeesController : ApiController
{

// GET api/ptemployees
[Route("api/ptemployees")]
public HttpResponseMessage Get()
{
var employees= EmployeesRepository.GetAllEmployees();
HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK, employees);
return response;
}

...
}

From http://www.dotnetcurry.com/aspnet/1063/create-rest-service-using-aspnet-webapi