我只使用一个中间件运行WebAPI,但无法设置响应HTTP状态代码。
我正在使用OnSendingHeaders()并能够添加标头并设置响应体,但状态代码未设置,响应始终将其设置为200 OK。
我可以在ValidateUrl(context)中设置响应状态代码。差异是同步调用ValidateUrl(context),并且在执行ProcessIncomingRequest()之后异步调用OnSendingHeaders()。
是否在调用OnSendingHeaders()之前发送HTTP状态行?
在异步处理传入请求时,我应该如何/在何处设置响应HTTP状态代码?
public class Startup
{
public void Configuration(IAppBuilder appBuilder)
{
appBuilder.Use(typeof(SampleMiddleware));
}
}
public class SampleMiddleware : OwinMiddleware
{
private string _responseBody = null;
public SampleMiddleware(OwinMiddleware next) : base(next)
{
}
public async override Task Invoke(IOwinContext context)
{
if (!ValidateUrl(context))
{
return;
}
context.Response.OnSendingHeaders(state =>
{
var cntxt = (IOwinContext)state;
SetResponseMessage(cntxt);
}, context);
await ProcessIncomingRequest();
await Next.Invoke(context);
}
private void SetResponseMessage(IOwinContext context)
{
//Setting status code
context.Response.StatusCode = 201;
//Setting headers
context.Response.Headers.Add("XYZ", new[] { "Value-1" });
context.Response.Headers.Add("ABC", new[] { "Value-2" });
//Setting response body
context.Response.Write(_responseBody);
}
private async Task ProcessIncomingRequest()
{
// Process request
//await ProcessingFunc();
// Set response body
_responseBody = "Response body based on above processing";
}
private bool ValidateUrl(IOwinContext context)
{
if (context.Request.Host.ToString().Equals("xyx"))
{
return true;
}
else
{
context.Response.StatusCode = 400;
context.Response.Write("Bad Request");
return false;
}
}
}
有人立即回复了我的上述帖子并建议在“等待ProcessIncomingRequest();”后移动OnSendingHeaders。建议工作!谢谢!奇怪的是,回复不再可见。
现在我打另一个问题了。当我在响应中添加Content-Length标头时,响应代码未设置并且默认为200 OK。有什么线索的原因?
public async override Task Invoke(IOwinContext context)
{
if (!ValidateUrl(context))
{
return;
}
await ProcessIncomingRequest();
context.Response.OnSendingHeaders(state =>
{
var cntxt = (IOwinContext)state;
SetResponseMessage(cntxt);
}, context);
}
private void SetResponseMessage(IOwinContext context)
{
//Setting status code
context.Response.StatusCode = 201;
//Setting headers
context.Response.Headers.Add("XYZ", new[] { "Value-1" });
context.Response.Headers.Add("ABC", new[] { "Value-2" });
//Status code is not getting set and default to 200 OK when I add Content-Length header
context.Response.Headers.Add("Content-Length", new[] { string.Format("{0}", _responseBody.Length) });
//Setting response body
context.Response.Write(_responseBody);
}