GraphQL–HotChocolate–Read HTTP headers

Quick tip if you want to read the HTTP headers from the incoming GraphQL request in .NET Core using HotChocolate.

There are 2 ways I found that can be used to achieve this:

1. Inject the IHttpContextAccessor in your resolvers.
2. Create a custom Query Interceptor and set the context data

First one is rather obvious but let’s see an example on how to take the second approach:

	services.AddQueryRequestInterceptor((ctx, builder, ct) =>
	{
	var headers=ctx.Response.Headers;
	builder.SetProperty("Culture", headers["culture"]);
	return Task.CompletedTask;
	});

view raw AddQueryRequestInterceptor.cs hosted with ❤ by GitHub

In your resolvers you can now access the context property through the ContextData directly or by injecting it:

	public Task<string> MyResolver([State("Culture")]string culture)
	{
	//Removed other code
	}

view raw MyResolver.cs hosted with ❤ by GitHub