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我知道这里有一个类似的问题。但是我的症状不同。似乎有某种我找不到记录的 URL 长度限制。URL 中的限制为 2084（原文如此！不是 2048！）个字符。最简单的复制只是一个带有以下代码的控制台应用程序：

#include "stdafx.h"
#include "urlmon.h"
#pragma comment(lib, "urlmon")


int main()
{
    HRESULT hr = URLDownloadToFile(NULL,L"http://www.google.de/images/branding/googlelogo/1x/googlelogo_color_272x92dp.png?oids=1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890,1234567890",
        L"c:\\temp\\x.png",
        0,
        NULL);

    return 0;
}

当然，URL 没有实际意义，在我的实际示例中，这些是重要的参数。只要我将 URL 缩短到 2084 个字符以下，我就会返回 S_OK，一切都很好。

我使用 Fiddler 检查请求，该请求告诉我我看到下载的 http 状态代码 200（OK），甚至服务器响应也很完美：

服务器响应

有没有办法使用 URLDownloadToFile 下载超过 2084 个字符的 URL？

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1 回答 1

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WinInet 的INTERNET_MAX_URL_LENGTH常数正好是 2084，包括一个空终止符。

另请参阅您可以传递给 Wininet 函数 HttpOpenRequest 的最大 URL 长度是多少？对于各种其他与 URL 相关的限制。

如果您需要下载更长的 URL，则必须使用另一个 HTTP 客户端库。

于 2018-03-07T08:34:08.647 回答