如何多次读取netcore 3中的http请求正文? [英] How can I read http request body in netcore 3 more than once?
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;
}
}
}
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