What is the maximum length of a URL in different browsers?
不同浏览器中URL的最大长度是多少？浏览器之间有区别吗？
HTTP协议规定了它吗？
简短回答-实际限制为2000个字符
如果将URL保持在2000个字符以下，它们几乎可以在任何客户机和服务器软件组合中工作。
如果您的目标是特定浏览器，请参阅下面的详细信息特定限制。
更长的答案-首先，标准……RFC2616(超文本传输协议HTTP/1.1)第3.2.1节说
The HTTP protocol does not place
any a priori limit on the length of
a URI. Servers MUST be able to handle
the URI of any resource they serve,
and SHOULD be able to handle URIs of
unbounded length if they provide
GET-based forms that could generate
such URIs. A server SHOULD return
414 (Request-URI Too Long) status if a
URI is longer than the server can
handle (see section 10.4.15).
该RFC已被RFC7230废弃，这是对HTTP/1.1规范的更新。它包含类似的语言，但也继续建议这样做：
Various ad hoc limitations on request-line length are found in
practice. It is RECOMMENDED that all HTTP senders and recipients
support, at a minimum, request-line lengths of 8000 octets.
…和现实
标准就是这么说的。要了解实际情况，请参阅boutell.com上的这项研究，了解各个浏览器和服务器实现将支持什么。值得一读，但执行摘要是：
Extremely long URLs are usually a
mistake. URLs over 2,000 characters
will not work in the most popular web
browsers. Don't use them if you intend
your site to work for the majority of
Internet users.
(注：这是2006年一篇文章的引言，但在2015年，IE的使用率下降意味着更长的URL对大多数人都有效。但是，仍有限制……)
Internet Explorer的限制…IE8的最大URL长度是2083个字符，而且似乎IE9也有类似的限制。
我已经测试过IE10，地址栏只接受2083个字符。您可以单击一个比这个长的URL，但是地址栏仍然只显示这个链接的2083个字符。
在IE内部博客上有一篇很好的文章，介绍了这方面的一些背景。
有混合报告IE11支持更长的URL-请参阅下面的注释。考虑到有些人报告问题，总的建议仍然有效。
搜索引擎如url<2048个字符…请注意，允许站点通知搜索引擎可用页面的站点地图协议在URL中的字符数限制为2048。如果您打算使用站点地图，已经为您确定了一个限制！(见下面的卡林·安德烈·布洛的回答)
还有一些从2010年开始的关于搜索引擎将对其进行爬行和索引的最大URL长度的研究。他们发现限制是2047个字符，这似乎与站点地图协议规范相关联。然而，他们也发现谷歌SERP工具无法处理超过1855个字符的URL。
其他浏览器汇总我在配置了非常大的limitrequestline和limitrequestfieldsize的Apache2.4服务器上测试了以下内容。
1 2 3 4 5 6 7 8 9 | 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 |
另请参阅下面来自Matas Vaitkevicius的答案。
这个信息是最新的吗？这是一个很受欢迎的问题，因为最初的研究已经有大约12年的历史了，所以我会尽量让它保持最新：截至2018年9月，建议仍然有效。尽管IE11可能接受更长的URL，但旧的IE安装的普遍性加上搜索引擎的限制意味着保持2000个字符以下是最好的一般策略。
我遇到的最长的URL是数据URL
来自Google图像结果的示例图像URL(11747个字符)
1 | 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 |
www常见问题解答：URL的最大长度是多少？基于实证检验和研究，有自己的答案。简而言之，超过2048个字符会使Internet Explorer不高兴，因此这是您应该使用的限制。请参阅本页了解详细答案。
我编写了这个测试，不断地向参数添加
C部分：
1 2 3 4 5 6 7 8 9 10 11 12 13 | [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(); } |
观点：
1 2 3 4 5 6 7 8 9 10 11 | <script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"> <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; }); |
第1部分
在Chrome上我得到了：
1 2 | Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.130 Safari/537.36 2046 |
然后爆炸了：
HTTP Error 404.15 - Not Found The request filtering module is
configured to deny a request where the query string is too long.
在Internet Explorer 8和Firefox上相同
1 2 3 4 5 | 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
我进入了简单模式，增加了iisexpress
1 2 3 | Chrome failed with message 'Bad Request - Request Too Long HTTP Error 400. The size of the request headers is too long. |
7744个字符之后。
1 2 | Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.130 Safari/537.36 7744 |
第3部分
补充
1 2 3 | <headerLimits> </headerLimits> |
这一点都没有帮助。我最后决定用小提琴把裁判从标题上除掉。
1 2 3 4 | static function OnBeforeRequest(oSession: Session) { if (oSession.url.Contains("localhost:50766")) { oSession.RequestHeaders.Remove("Referer"); } |
做得很好。
Chrome:15613个字符。(我想这是iIS的16K限制)
它又失败了：
1 2 3 4 5 6 7 8 | <BODY>Bad Request - Request Too Long <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 |
Firefox：
1 2 | Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0 15708 |
Internet Explorer 8失败，IExplore.exe崩溃。
2505后
1 2 | 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 |
模拟器
1 2 | 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 |
Internet Explorer 11
1 2 | 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 |
Internet Explorer 10
1 2 | 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 |
Internet Explorer 9
1 2 | Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0) 4043 |
实际上没有通用的最大URL长度。最大长度仅由客户端浏览器选择支持的内容决定，这一点差异很大。2083限制仅在Internet Explorer中存在(所有版本最多7.0)。火狐和Safari的最大长度似乎是无限的，尽管当URL达到65000个字符时会出现不稳定。Opera似乎没有任何最大的URL长度，并且不会在非常长的长度上受到不稳定的影响。
URI RFC(其中的URL是一个子集)没有定义最大长度，但是，它建议URI的主机名部分(如果适用)的长度不超过255个字符：
URI producers should use names that
conform to the DNS syntax, even when
use of DNS is not immediately
apparent, and should limit these names
to no more than 255 characters in
length.
不过，正如其他文章所指出的，有些浏览器对URL的长度有实际限制。
On apple platforms(IOS/MACOS/TVOS/Watchos)，the limit may be a 2 gb long url scheme，as seen by this comment in the source code of SWIFT：
2
3
4
5
// We're limiting it to 2GB for backwards compatibility with 32-bit executables using NS/CFURL
if ( (urlStringLength > 0) && (urlStringLength <= INT_MAX) )
{
...
在IOS上，我测试并确认，即使是一个300+MB长URL也被接受。你可以尝试像这样的长URL
1 2 3 | NSString *path = [@"a:" stringByPaddingToLength:314572800 withString:@"a" startingAtIndex:0]; NSString *js = [NSString stringWithFormat:@"window.location.href = "%@";", path]; [self.webView stringByEvaluatingJavaScriptFromString:js]; |
And catch if it succeed with：
ZZU1
HTTP 1.1规范指出：
URIs in HTTP can be represented in
absolute form or relative to some
known base URI [11], depending upon
the context of their use. The two
forms are differentiated by the fact
that absolute URIs always begin
with a scheme name followed by a
colon. For definitive information on
URL syntax and semantics, see"Uniform
Resource Identifiers (URI): Generic
Syntax and Semantics," RFC 2396 [42]
(which replaces RFCs 1738 [4] and
RFC 1808 [11]). This specification
adopts the definitions of
"URI-reference","absoluteURI",
"relativeURI","port",
"host","abs_path","rel_path", and
"authority" from that
specification.The HTTP protocol does not place
any a priori limit on the length of
a URI. Servers MUST be able to handle
the URI of any resource they serve,
and SHOULD be able to handle URIs of
unbounded length if they provide
GET-based forms that could generate
such URIs.* A server SHOULD return
414 (Request-URI Too Long) status if a
URI is longer than the server can
handle (see section 10.4.15).Note: Servers ought to be cautious about depending on URI
lengths
above 255 bytes, because some older client or proxy
implementations might not properly support these lengths.
正如@brian所提到的，HTTP客户机(例如浏览器)可能有自己的限制，而HTTP服务器将有不同的限制。
微软支持称"Internet Explorer中的最大URL长度为2083个字符"。
IE的URL问题比这长。火狐似乎可以在4K以上的字符上运行。
在ui jakob nielsen建议的url中：
the social interface to the Web relies on email when users want to recommend Web pages to each other, and email is the second-most common way users get to new sites (search engines being the most common): make sure that all URLs on your site are less than 78 characters long so that they will not wrap across a line feed.
这不是最大值，但如果您希望共享您的URL，我会将其视为实际最大值。
站点地图协议(sitemaps protocol)支持少于2048个字符的URL，它是网站管理员向搜索引擎通知其网站上的页面的一种方式(也可由谷歌在网站管理员工具中使用)。因此，如果您计划将此功能用于搜索引擎优化，请考虑到这一点。
ASP.NET 2和SQL Server Reporting Services 2005的限制为2028。我发现这很难，因为我的动态URL生成器不会将某些参数传递给超过该点的报表。这是在Internet Explorer 8下进行的。
为什么Internet Explorer的限制仅为2K，而IIS的限制为16K？我觉得这没道理。
所以我想开始一个关于Ajax请求URL大小限制的实验。
我已经设置了Tomcat HTTP连接器的maxhttpheadersize="1048576"。准备了一个很长的网址。
然后我用长URL发送一个请求，如下所示：
1 2 | var url="/ajax/url-length.jsp"; jQuery.ajax(url,{data:{q:"0".repeat(1048000-url.length-4)}}); |
jquery报告完成。Tomcat报告请求的URL为1048015字节。它通过Chrome50和Internet Explorer 11进行了测试。
因此，在发送Ajax请求时，Web浏览器不会故意截断或限制URL。
limit request line指令设置URL的最大长度。默认情况下，它设置为8190，这会给您很大的空间。然而，其他服务器和一些浏览器，限制的长度更多。
因为所有参数都在URL行上传递，所以隐藏字段密码中的项目当然也会显示在URL中。任何移动设备都不应被用于真正的安全措施，最好被视为化妆品安全。
我在SharePoint2007、2010方面有经验，在这种情况下，您可以从服务器端创建的URL长度是有限制的，因此它主要取决于：1)客户端(浏览器、版本和操作系统)和2)服务器技术、IIS、Apache等。
看来铬至少提高了这个极限。我在书签上贴了2万个字，然后就这样。