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HttpWebrequest正在引发404的异常

asp.net

5

Danil · 技术社区 · 15 年前

我发现HttpWebRequest正在为不存在的资源投递WebExpRebug。在我看来很奇怪,因为HttpWebResponse有StaseCal码属性(NoTunt项目存在)。你认为这有什么原因吗?也许只是开发人员的问题?

var req = (HttpWebRequest)WebRequest.Create(someUrl);
using (HttpWebResponse response = (HttpWebResponse)req.GetResponse()) {
    if (response.StatusCode == HttpStatusCode.OK) { ...}
}

2 回复 | 直到 15 年前

1

3

Garrett Serack 14 年前

这确实是一个令人沮丧的问题,可以通过使用以下扩展方法类和调用request.betterGetResponse()来解决这个问题

//-----------------------------------------------------------------------
//
//     Copyright (c) 2011 Garrett Serack. All rights reserved.
//
//
//     The software is licensed under the Apache 2.0 License (the "License")
//     You may not use the software except in compliance with the License.
//
//-----------------------------------------------------------------------

namespace CoApp.Toolkit.Extensions {
    using System;
    using System.Net;

    public static class WebRequestExtensions {
        public static WebResponse BetterEndGetResponse(this WebRequest request, IAsyncResult asyncResult) {
            try {
                return request.EndGetResponse(asyncResult);
            }
            catch (WebException wex) {
                if( wex.Response != null ) {
                    return wex.Response;
                }
                throw;
            }
        }

        public static WebResponse BetterGetResponse(this WebRequest request) {
            try {
                return request.GetResponse();
            }
            catch (WebException wex) {
                if( wex.Response != null ) {
                    return wex.Response;
                }
                throw;
            }
        }
    }
}

你在我的博客上看到了更多关于这个主题的信息 http://fearthecowboy.com/2011/09/02/fixing-webrequests-desire-to-throw-exceptions-instead-of-returning-status/

2

1

Community Mohan Dere 9 年前

试试这个:

var req = (HttpWebRequest)WebRequest.Create(someUrl);
req.Method = "Head";

using (HttpWebResponse response = (HttpWebResponse)req.GetResponse()) {
    if (response.StatusCode == HttpStatusCode.OK) { ...}
}

WebRequest and System.Net.WebException on 404, slow?