blocks|key|495938|text|EDIT+(2019)这个答案现在是非常多余的，但有更多相关信息的another+answer。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|495939|它相当依赖于web服务器和web浏览器：|495940|Internet+explorer所有版本2+2GB+1|495941|Mozilla+Firefox所有版本2+2GB+1|495942|IIS+1-5+2+2GB+1|495943|IIS+6+4+4GB+1|495944|虽然IIS默认情况下只支持200KB，但元数据库需要修改以增加此容量。|495945|http://www.motobit.com/help/scptutl/pa98.htm|495946|POST方法本身对数据大小没有任何限制。|495947|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/2880722/can-http-post-be-limitless/55998160#55998160|1^0|0|B|X|E|0|0|0|0|H|0|0|F|0|0|3|0|0|3|0|0|0|18|1|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@$9|17|A|18|1|19]]|E|$]]|$1|F|3|G|5|6|7|1A|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|1B|8|@$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|1E|8|@$9|1F|A|1G|B|C]]|D|@]|E|$]]|$1|L|3|M|5|6|7|1H|8|@$9|1I|A|1J|B|C]]|D|@]|E|$]]|$1|N|3|O|5|6|7|1K|8|@$9|1L|A|1M|B|C]]|D|@]|E|$]]|$1|P|3|Q|5|6|7|1N|8|@]|D|@]|E|$]]|$1|R|3|S|5|6|7|1O|8|@]|D|@$9|1P|A|1Q|1|1R]]|E|$]]|$1|T|3|U|5|6|7|1S|8|@]|D|@]|E|$]]|$1|V|3|-4|5|6|7|1T|8|@]|D|@]|E|$]]]|W|$X|$5|Y|Z|10|E|$11|12]]|13|$5|Y|Z|10|E|$11|S]]]]

EDIT (2019) This answer is now pretty redundant but there is <a href="https://stackoverflow.com/questions/2880722/can-http-post-be-limitless/55998160#55998160">another answer</a> with more relevant information.

It rather depends on the web server and web browser:

Internet explorer All versions 2GB-1 
Mozilla Firefox All versions 2GB-1 
IIS 1-5 2GB-1 
IIS 6 4GB-1 

Although IIS only support 200KB by default, the metabase needs amending to increase this.

<a href="http://www.motobit.com/help/scptutl/pa98.htm" rel="noreferrer">http://www.motobit.com/help/scptutl/pa98.htm</a>

The POST method itself does not have any limit on the size of data.

blocks|key|496010|text|令人惊讶的是，所有答案都在谈论IIS，就好像那是唯一重要的web服务器一样。早在2010年，当这个问题被问到时，阿帕奇就已经在60%25和70%25+of+the+market+share之间产生了分歧。不管怎样，|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|496011|496012|+HTTP协议没有指定限制。|unordered-list-item|496013|+POST方法允许发送比GET方法多得多的数据，GET方法受URL+length限制-大约2KB。|496014|在HTTP服务器上配置最大POST+request+body大小，通常范围为|496015|496016|HTTP1MB到2GB|496017|The+客户端(浏览器或其他用户代理)可能有其自身的限制。因此，POST正文请求的最大大小为min(serverMaximumSize,+clientMaximumSize).|style|BOLD|CODE|496018|496019|下面是一些比较流行的HTTP服务器的POST正文大小：|496020|undocumented+|496021|Nginx+(截止2019年4月的largest+web+server+market+share)-默认1MB，无实际最大documented|496022|IIS+-+default+28.6MB，请求长度无默认值undocumented|496023|-+maximum+2GB，查询字符串2048字节；最大undocumented|496024|InfluxDB+-+default+~25MB，最大Nginx|496025|496026|entityMap|0|LINK|mutability|MUTABLE|url|https://news.netcraft.com/archives/2010/12/01/december-2010-web-server-survey.html|1|https://w3techs.com/technologies/history_overview/web_server/ms/y|2|https://stackoverflow.com/questions/417142/what-is-the-maximum-length-of-a-url-in-different-browsers|3|https://stackoverflow.com/questions/14551194/how-are-parameters-sent-in-an-http-post-request|4|https://news.netcraft.com/archives/2019/04/22/april-2019-web-server-survey.html|5|https://stackoverflow.com/questions/28476643/default-nginx-client-max-body-size/28476755#28476755|6|https://docs.microsoft.com/en-us/iis/configuration/system.webserver/security/requestfiltering/requestlimits/#attributes|7|https://httpd.apache.org/docs/2.4/mod/core.html#limitrequestbody|8|https://docs.influxdata.com/influxdb/latest/administration/config/#max-body-size-25000000^0|1R|3|0|1V|N|1|0|0|0|U|A|2|0|D|H|3|0|0|0|4|2C|1A|15|0|0|0|R|0|0|D|0|0|1Z|H|V|4|1G|3|5|0|0|15|6|E|6|0|0|14|2|B|7|0|0|W|B|D|8|0|0^^$0|@$1|2|3|4|5|6|7|1V|8|@]|9|@$A|1W|B|1X|1|1Y]|$A|1Z|B|20|1|21]]|C|$]]|$1|D|3|-4|5|6|7|22|8|@]|9|@]|C|$]]|$1|E|3|F|5|G|7|23|8|@]|9|@]|C|$]]|$1|H|3|I|5|G|7|24|8|@]|9|@$A|25|B|26|1|27]]|C|$]]|$1|J|3|K|5|G|7|28|8|@]|9|@$A|29|B|2A|1|2B]]|C|$]]|$1|L|3|-4|5|6|7|2C|8|@]|9|@]|C|$]]|$1|M|3|N|5|6|7|2D|8|@]|9|@]|C|$]]|$1|O|3|P|5|G|7|2E|8|@$A|2F|B|2G|Q|R]|$A|2H|B|2I|Q|S]]|9|@]|C|$]]|$1|T|3|-4|5|6|7|2J|8|@]|9|@]|C|$]]|$1|U|3|V|5|6|7|2K|8|@$A|2L|B|2M|Q|R]]|9|@]|C|$]]|$1|W|3|X|5|6|7|2N|8|@$A|2O|B|2P|Q|R]]|9|@]|C|$]]|$1|Y|3|Z|5|G|7|2Q|8|@$A|2R|B|2S|Q|R]]|9|@$A|2T|B|2U|1|2V]|$A|2W|B|2X|1|2Y]]|C|$]]|$1|10|3|11|5|G|7|2Z|8|@$A|30|B|31|Q|R]]|9|@$A|32|B|33|1|34]]|C|$]]|$1|12|3|13|5|6|7|35|8|@$A|36|B|37|Q|R]]|9|@$A|38|B|39|1|3A]]|C|$]]|$1|14|3|15|5|G|7|3B|8|@$A|3C|B|3D|Q|R]]|9|@$A|3E|B|3F|1|3G]]|C|$]]|$1|16|3|-4|5|6|7|3H|8|@]|9|@]|C|$]]|$1|17|3|-4|5|6|7|3I|8|@]|9|@]|C|$]]]|18|$19|$5|1A|1B|1C|C|$1D|1E]]|1F|$5|1A|1B|1C|C|$1D|1G]]|1H|$5|1A|1B|1C|C|$1D|1I]]|1J|$5|1A|1B|1C|C|$1D|1K]]|1L|$5|1A|1B|1C|C|$1D|1M]]|1N|$5|1A|1B|1C|C|$1D|1O]]|1P|$5|1A|1B|1C|C|$1D|1Q]]|1R|$5|1A|1B|1C|C|$1D|1S]]|1T|$5|1A|1B|1C|C|$1D|1U]]]]

Quite amazing how all answers talk about IIS, as if that were the only web server that mattered. Even back in 2010 when the question was asked, Apache had between <a href="https://news.netcraft.com/archives/2010/12/01/december-2010-web-server-survey.html" rel="noreferrer">60%</a> and <a href="https://w3techs.com/technologies/history_overview/web_server/ms/y" rel="noreferrer">70% of the market share</a>. Anyway,
<ul>
<li>The HTTP protocol does not specify a limit.</li>
<li>The POST method allows sending far more data than the GET method, which is limited by the <a href="https://stackoverflow.com/questions/417142/what-is-the-maximum-length-of-a-url-in-different-browsers">URL length</a> - about 2KB.</li>
<li>The maximum <a href="https://stackoverflow.com/questions/14551194/how-are-parameters-sent-in-an-http-post-request">POST request body</a> size is configured on the HTTP server and typically ranges from 
1MB to 2GB</li>
<li>The HTTP client (browser or other user agent) can have its own limitations. Therefore, the maximum POST body request size is <code>min(serverMaximumSize, clientMaximumSize)</code>.</li>
</ul>
Here are the POST body sizes for some of the more popular HTTP servers:
<ul>
<li>Nginx (<a href="https://news.netcraft.com/archives/2019/04/22/april-2019-web-server-survey.html" rel="noreferrer">largest web server market share</a> as of April 2019) - default <a href="https://stackoverflow.com/questions/28476643/default-nginx-client-max-body-size/28476755#28476755">1MB</a>, no practical maximum (<a href="https://stackoverflow.com/questions/28476643/default-nginx-client-max-body-size/28476755?noredirect=1#comment98741319_28476755">2**63</a>)</li>
<li>Apache - <a href="https://httpd.apache.org/docs/2.4/mod/core.html#limitrequestbody" rel="noreferrer">maximum 2GB</a>, no default documented</li>
<li>IIS - <a href="https://docs.microsoft.com/en-us/iis/configuration/system.webserver/security/requestfiltering/requestlimits/#attributes" rel="noreferrer">default 28.6MB</a> for the request length, 2048 bytes for the query string; maximum undocumented</li>
<li>InfluxDB - <a href="https://docs.influxdata.com/influxdb/latest/administration/config/#max-body-size-25000000" rel="noreferrer">default ~25MB</a>, maximum undocumented</li>
</ul>

blocks|key|497498|text|根据HTTP协议本身没有限制，但实现将有一个实际的上限。我使用POST向Apache发送了超过4+GB的数据，但有些服务器当时确实有4+GB的限制。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|497499|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

There is no limit according to the HTTP protocol itself, but implementations will have a practical upper limit. I have sent data exceeding 4 GB using POST to Apache, but some servers did have a limit of 4 GB at the time.

blocks|key|3364548|text|POST允许将任意长度的数据发送到服务器，但存在基于超时/带宽等的限制。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3364549|我认为基本上，假设发送大量数据是不好的，这是更安全的。|3364550|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

POST allows for an arbitrary length of data to be sent to a server, but there are limitations based on timeouts/bandwidth etc.

I think basically, it's safer to assume that it's not okay to send lots of data.

blocks|key|1956661|text|HTTP可能没有上限，但one服务器可能有上限。在ASP.NET中，默认的接受限制是4MB，但您(开发人员/站长)可以将其更改为更高或更低。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1956662|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

HTTP may not have an upper limit, but webservers may have one. In ASP.NET there is a default accept-limit of 4&nbsp;MB, but you (the developer/webmaster) can change that to be higher or lower.

blocks|key|3364638|text|在我正在开发的一个应用程序中，我遇到了大约2KB的帖子限制。事实证明，我无意中将参数编码到URL中，而不是将它们传递到主体中。因此，如果你在那里遇到了问题，那么你可以发送的编码到URL中的POST数据的大小肯定有一个非常小的限制。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3364639|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In an application I was developing I ran into what appeared to be a POST limit of about 2KB. It turned out to be that I was accidentally encoding the parameters into the URL instead of passing them in the body. So if you're running into a problem there, there is definitely a very small limit on the size of POST data you can send encoded into the URL.

I heard that HTTP POST has no specification limit in data size it can be sent by. Is that true or is there just some really high limit?

Can HTTP POST be limitless?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我听说HTTP POST对它可以发送的数据大小没有规范限制。这是真的吗?还是真的有一些很高的限制？

问HTTP POST可以无限吗？
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问HTTP POST可以无限吗？
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