WWW FAQs:什么是URL的最大长度?有自己的答案,基于实验测试和研究. 简短的答案是,超过2048个字符使Internet Explorer不快乐,因此这是你应该使用的限制。

URI RFC(其中URL是子组)不确定最大长度,但是,它建议主机名称部分的URI(如适用)不超过255个字符的长度:

URI 制造商应该使用符合 DNS 合成的名称,即使使用 DNS 并非立即显而易见,并且应该限制这些名称的长度不超过 255 个字符。

然而,正如其他文章所指出的那样,一些浏览器对URL的长度有实用的限制。

HTTP 1.1 规格说:

HTTP 中的 URI 可以以绝对的形式或与某些已知基础的 URI 相对,取决于它们的使用背景。 两种形式因绝对的 URI 总是以一个序列名称开始而有所区别。 有关 URL 合成和序列的最终信息,请参见“统一资源识别器(URI):通用序列和序列”。

正如 @Brian 提到的那样, HTTP 客户端(例如浏览器)可能有自己的限制,而 HTTP 服务器则会有不同的限制。

我遇到的最长的URL是数据URL

Google 图像结果中的示例图像 URL (11747 个字符)

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

更长的答案 - 首先,标准...

建议所有 HTTP 发送者和接收者支持,至少,请求线长度为 8000 位元。

事实上,在 boutell.com 上有一篇文章(链接到 Internet Archive 备份)讨论了个人浏览器和服务器实施将支持什么。

(注:这是2006年写的一篇文章的引用,但2015年 IE 的使用量下降意味着更长的 URL 为多数工作。

Internet Explorer 的限制

还有一些研究从2010年到搜索引擎将浏览和索引的最大 URL 长度. 他们发现的限制是 2047 台,看起来与 Sitemap 协议规格相关联. 然而,他们也发现谷歌 SERP 工具不会处理超过 1855 台的 URL。

(信用到 timrs2998 提供此信息在评论中)

浏览器 Roundup

Browser     Address bar   document.location
                          or anchor tag
------------------------------------------
Chrome          32779           >64k
Android          8192           >64k
Firefox          >64k           >64k
Safari           >64k           >64k
IE11             2047           5120
Edge 16          2047          10240

此外,请参见下面的答案来自Matas Vaitkevicius。

我写了这个测试,它继续添加“A”到参数,直到浏览器失败。

C# 部分:

[AcceptVerbs(HttpVerbs.Get)]
public ActionResult ParamTest(string x)
{
    ViewBag.TestLength = 0;
    if (!string.IsNullOrEmpty(x))
    {
        System.IO.File.WriteAllLines("c:/result.txt",
                       new[] {Request.UserAgent, x.Length.ToString()});
        ViewBag.TestLength = x.Length + 1;
    }

    return View();
}

观看:

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

<script type="text/javascript">
    $(function() {
        var text = "a";
        for (var i = 0; i < parseInt(@ViewBag.TestLength)-1; i++) {
            text += "a";
        }

        document.location.href = "http://localhost:50766/Home/ParamTest?x=" + text;
    });
</script>

第一部分

在Chrome中,我得到了:

Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.130 Safari/537.36
2046

然后,它与:

与 Internet Explorer 8 和 Firefox 相同

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET4.0C; .NET4.0E)
2046

Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0
2046

第2部分

Chrome failed with message 'Bad Request - Request Too Long

HTTP Error 400. The size of the request headers is too long.

7744个字符。

Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.130 Safari/537.36
7744

第三部分

添加

<headerLimits>
    <add header="Content-type" sizeLimit="32768" />
</headerLimits>

我终于决定使用fiddler从头部移除参考器。

static function OnBeforeRequest(oSession: Session) {
    if (oSession.url.Contains("localhost:50766")) {
        oSession.RequestHeaders.Remove("Referer");
    }

谁做得好。

Chrome: 獲得 15613 個字符(我猜 IIS 的 16K 限制)

又一次失败了:

<BODY><h2>Bad Request - Request Too Long</h2>
<hr><p>HTTP Error 400. The size of the request headers is too long.</p>


Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.130 Safari/537.36
15613

福克斯:

Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0
15708

此分類上一篇

第2505章

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET4.0C; .NET4.0E)
2505

Android 模拟器

Mozilla/5.0 (Linux; Android 5.1; Android SDK built for x86 Build/LKY45) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/39.0.0.0 Mobile Safari/537.36
7377

浏览器 11

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C)
4043

浏览器 10

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/6.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C)
4043

浏览器 9

Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)
4043