如何多次读取netcore 3中的http请求正文?

本文介绍了如何多次读取netcore 3中的http请求正文?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我有一个netcore 3 API应用程序，该应用程序记录传入的请求，然后将其传递给控制器​​操作.

I have a netcore 3 API application that logs the incoming request and then passes it on to the controller action.

我的代码如下:

public RequestLoggingHandler(IHttpContextAccessor httpContextAccessor) { _httpContextAccessor = httpContextAccessor; } protected override Task HandleRequirementAsync(AuthorizationHandlerContext context, RequestLoggingRequirement requirement) { try { var httpContext = _httpContextAccessor.HttpContext; var request = httpContext.Request; _repository = (ICleanupOrderRepository)httpContext.RequestServices.GetService(typeof(ICleanupOrderRepository)); _cache = (IMemoryCache)httpContext.RequestServices.GetService(typeof(IMemoryCache)); httpContext.Items["requestId"] = SaveRequest(request); context.Succeed(requirement); return Task.CompletedTask; } catch (Exception ex) { throw ex; } } private int SaveRequest(HttpRequest request) { try { // Allows using several time the stream in ASP.Net Core var buffer = new byte[Convert.ToInt32(request.ContentLength)]; request.Body.ReadAsync(buffer, 0, buffer.Length); var requestContent = Encoding.UTF8.GetString(buffer); var requestId = _repository.SaveRawHandlerRequest($"{request.Scheme} {request.Host}{request.Path} {request.QueryString} {requestContent}"); return requestId; } catch (Exception ex) { throw ex; } }

但是，当此请求传递到Controller时，请求正文为null.

However when this request is passed on to the Controller the request body is null.

以前您可以在Core2.x中完成

Previously in Core2.x you could do

request.EnableRewind();

我的理解是，现在已替换为

My understanding is this is now replaced with

httpContext.Request.EnableBuffering();

但是，即使使用

httpContext.Request.EnableBuffering();

读取请求正文后，请求正文仍为null.

the request body is still null once the request body is read.

我该如何解决?

推荐答案

这是已知的问题在github上.

It is a known issue on github.

临时的解决方法是在调用EnableBuffering之后立即拉出主体，然后将流倒回至0而不进行处理:

A temp workaround is to pull out the body right after the call to EnableBuffering and then rewinding the stream to 0 and not disposing it:

public class RequestLoggingHandler : AuthorizationHandler<RequestLoggingRequirement> { private readonly IHttpContextAccessor _httpContextAccessor; public RequestLoggingHandler(IHttpContextAccessor httpContextAccessor) { _httpContextAccessor = httpContextAccessor; } protected override Task HandleRequirementAsync(AuthorizationHandlerContext context, RequestLoggingRequirement requirement) { try { var httpContext = _httpContextAccessor.HttpContext; var request = httpContext.Request; request.EnableBuffering(); httpContext.Items["requestId"] = SaveRequest(request); context.Succeed(requirement); return Task.CompletedTask; } catch (Exception ex) { throw ex; } } private int SaveRequest(HttpRequest request) { try { // Allows using several time the stream in ASP.Net Core var buffer = new byte[Convert.ToInt32(request.ContentLength)]; request.Body.ReadAsync(buffer, 0, buffer.Length); var requestContent = Encoding.UTF8.GetString(buffer); var requestId = _repository.SaveRawHandlerRequest($"{request.Scheme} {request.Host}{request.Path} {request.QueryString} {requestContent}"); request.Body.Position = 0;//rewinding the stream to 0 return requestId; } catch (Exception ex) { throw ex; } } }