这个问题一直以来似乎是被N多人误解，其实Http Get方法提交的数据大小长度并没有限制，而是IE浏览器本身对地址栏URL长度有最大长度限制：2048个字符。
当您从 WinInet 应用程序到 Web 服务器发送一个长的查询字符串时，查询字符串可能会被截断。
出现此问题是由于中 WinInet，定义 Wininet.h 文件中，如下所示的 URL 的长度限制：
#define INTERNET_MAX_PATH_LENGTH 2048
#define INTERNET_MAX_SCHEME_LENGTH 32 // longest protocol name length
#define INTERNET_MAX_URL_LENGTH (INTERNET_MAX_SCHEME_LENGTH + sizeof("://") + INTERNET_MAX_PATH_LENGTH)
此行为是设计使然。
注意： 因为 Internet Explorer 和 Internet 传输的控制也使用 WinInet，可能会出现相同的问题。
若要解决此问题，使用 HTTP POST 方法。
http://support.microsoft.com/kb/208427/zh-cn
Microsoft Internet Explorer has a maximum uniform resource locator (URL) length of 2,083 characters. Internet Explorer also has a maximum path length of 2,048 characters. This limit applies to both POST request and GET request URLs. ‘>以下附上微软官方的一段说明：
Microsoft Internet Explorer has a maximum uniform resource locator (URL) length of 2,083 characters. Internet Explorer also has a maximum path length of 2,048 characters. This limit applies to both POST request and GET request URLs. ‘>Microsoft Internet Explorer has a maximum uniform resource locator (URL) length of 2,083 characters. Internet Explorer also has a maximum path length of 2,048 characters. This limit applies to both POST request and GET request URLs.
If you are using the GET method, you are limited to a maximum of 2,048 characters, minus the number of characters in the actual path.
However, the POST method is not limited by the size of the URL for submitting name/value pairs. These pairs are transferred in the header and not in the URL. ‘>However, the POST method is not limited by the size of the URL for submitting name/value pairs. These pairs are transferred in the header and not in the URL.
RFC 2616, “Hypertext Transfer Protocol — HTTP/1.1,” does not specify any requirement for URL length.
标签：http,Explorer,get,URL,maximum,length,characters,Internet,长度 From： https://www.cnblogs.com/kn-zheng/p/17001026.html