新京葡娱乐场网址关于URL最大长度限制的相关资料查证_php技巧_脚本之家

在开发调试支付宝接口时,突然发现支付宝接口的URL很长,远远大于之前自己印象中的255个字符。赶紧搜索查证了一番,理解如下:

URL不能大于255bytes的说法确实存在,在RFC2616中提到:

复制代码 代码如下: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 status if a URI is
longer than the server can handle .

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.

从上一点也可以看出,255bytes的说法也是为了兼容性考虑。实际上现代浏览器的限制如下:

复制代码 代码如下:Microsoft Internet
Explorer
Microsoft states that the maximum length of a URL in Internet
Explorer is 2,083 characters, with no more than 2,048 characters in the
path portion of the URL. In my tests, attempts to use URLs longer than
this produced a clear error message in Internet Explorer.

Firefox After 65,536 characters, the location bar no longer displays
the URL in Windows Firefox 1.5.x. However, longer URLs will work. I
stopped testing after 100,000 characters.

Safari At least 80,000 characters will work. I stopped testing after
80,000 characters.

Opera At least 190,000 characters will work. I stopped testing after
190,000 characters. Opera 9 for Windows continued to display a fully
editable, copyable and pasteable URL in the location bar even at 190,000
characters.

Apache My early attempts to measure the maximum URL length in web
browsers bumped into a server URL length limit of approximately 4,000
characters, after which Apache produces a “413 Entity Too Large” error.
I used the current up to date Apache build found in Red Hat Enterprise
Linux 4. The official Apache documentation only mentions an 8,192-byte
limit on an individual field in a request.

Microsoft Internet Information Server The default limit is 16,384
characters (yes, Microsoft's web server accepts longer URLs than
Microsoft's web browser). This is configurable.

Perl HTTP::Daemon Up to 8,000 bytes will work. Those constructing
web application servers with Perl's HTTP::Daemon module will encounter a
16,384 byte limit on the combined size of all HTTP request headers. This
does not include POST-method form data, file uploads, etc., but it does
include the URL. In practice this resulted in a 413 error when a URL was
significantly longer than 8,000 characters. This limitation can be
easily removed. Look for all occurrences of 16×1024 in Daemon.pm and
replace them with a larger value. Of course, this does increase your
exposure to denial of service attacks.

另外值得注意的是,有文章提到作为的href属性时,URL不能超过1024bytes,这点没有详细查证

综上,URL还是不适合太长,不是不得已,尽量不要通过GET方式提交大量参数,可以考虑用POST方式。另外这么长的URL在访问和收藏(有文章提到有些浏览器在收藏超长地址时也是会出现问题)时也是相当不友好的。当然,之前数据库字段设置时还是作为255bytes处理,现在可能要考虑扩充一下了。

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