.net core reads Response.Body

.net core reads Response.Body Demo of reading request body stream public static async Task GetBodyForm(this HttpContext http) { var content = string.Empty; var request = http.Request; try { request.Body.Position = 0; using var reader = new StreamReader(request.Body, Encoding.UTF8, leaveOpen: true); var strRequestBody = await reader.ReadToEndAsync(); Console.WriteLine(“ok”); Console.WriteLine(strRequestBody == null ? “null” : strRequestBody); request.Body.Position = 0; } catch (Exception ex) { Console.WriteLine(“err”); Console.WriteLine(ex); } return content; } Read Request.Body in ActionFilter public class ActionFilterTestA : ActionFilterAttribute { public override async void OnActionExecuting(ActionExecutingContext context) { Console.WriteLine(“From Request Body—->”); Console.WriteLine(await context.HttpContext.GetBodyForm()); Console.WriteLine(“From Request Body—->”); } } An error is reported, usually NotSupportedException is reported at Request.Body Solution Call EnableBuffering() in custom middleware app.Use(async (context, next) => { context.Request.EnableBuffering(); await next(); }); Question (Remove the correct solution code above) Why does calling context.HttpContext.Request.EnableBuffering(); in ActionFilterTestA have no effect? (No error is reported, but the content is an empty string) Guess The request body flow is consumed before the ActionFilter and after the custom middleware. Middleware execution sequence Test // Cancel model binding builder.Services.Configure(options => { options.SuppressInferBindingSourcesForParameters = true; }); The content of Request.Body is printed successfully. Inference The request body stream will be consumed when binding the model. Other information https://markb.uk/asp-net-core-read-raw-request-body-as-string.html Conclusion It…