using MediaTypeHeaderValue

Author: Raul Hidalgo Caballero

src/GraphQL.Client/GraphQLClient.cs

@@ -130,7 +130,7 @@ public async Task<GraphQLResponse> PostAsync(GraphQLRequest request) {
 			if (request.Query == null) { throw new ArgumentNullException(nameof(request.Query)); }
 
 			var graphQLString = JsonConvert.SerializeObject(request, this.Options.JsonSerializerSettings);
-			var httpContent = new StringContent(graphQLString, Encoding.UTF8, this.Options.MediaType);
+			var httpContent = new StringContent(graphQLString, Encoding.UTF8, this.Options.MediaType.MediaType);
 			var httpResponseMessage = await this.httpClient.PostAsync(this.EndPoint, httpContent).ConfigureAwait(false);
 			return await this.ReadHttpResponseMessageAsync(httpResponseMessage).ConfigureAwait(false);
 		}

src/GraphQL.Client/GraphQLClientOptions.cs

@@ -33,7 +33,7 @@ public class GraphQLClientOptions {
 		/// <summary>
 		/// The <see cref="MediaTypeHeaderValue"/> that will be send on POST
 		/// </summary>
-		public string MediaType { get; set; } = "application/json"; // This should be "application/graphql" also "application/x-www-form-urlencoded" is Accepted
+		public MediaTypeHeaderValue MediaType { get; set; } = new MediaTypeHeaderValue("application/json"); // This should be "application/graphql" also "application/x-www-form-urlencoded" is Accepted
 
 	}