发送（）数据参数对XMLHtt prequest后最大长度 [英] Max length of send() data param on XMLHttpRequest Post

问题描述

是否有记载的最大的字符串数据，你可以在一个XMLHtt prequest发送方法使用的主要浏览器实现的长度？

我遇到了一个问题，一个JavaScript XMLHtt prequest后未能在Firefox 3中，当数据超过约3K。我是假设后会具有相同的行为作为一个传统的表单提交。

在W3C文档提到的发送方法的数据参数是上DOMString，但我不知道各大浏览器是如何实现的。

下面是我的JavaScript，如果bigText超过约3K失败，否则它的工作原理...

的简化版本

  VAR xhReq = createXMLHtt prequest（）;

功能createXMLHtt prequest（）{
  尝试{返回新的ActiveXObject（MSXML2.XMLHTTP）; }赶上（五）{}
  尝试{返回新的ActiveXObject（Microsoft.XMLHTTP）; }赶上（五）{}
  尝试{返回新XMLHtt prequest（）; }赶上（五）{}
  警报（不支持XMLHtt prequest）;
  返回null;
}

功能mySubmit（ID，bigText）{
  VAR URL =SubmitPost.cfm;
  VAR PARAMS =ID =+编号+＆放大器; bigtext =EN + codeURI（bigText）;

  xhReq.open（POST，网址，真实）;

  //发送的标题信息与请求一起
  xhReq.setRequestHeader（内容型，应用程序/ x-WWW的形式urlen codeD）;
  xhReq.setRequestHeader（内容长度，params.length）;
  xhReq.setRequestHeader（连接，关闭）;

  xhReq.onreadystatechange = onPostSubmit;
  xhReq.send（PARAMS）;
}

功能onPostSubmit（）{

  如果（xhReq.readyState == 4 || xhReq.readyState ==完成）
     {
     如果（xhReq.status！= 200）
        {
        警报（'BadStatus'）;
        返回;
        }
    }
}
 

解决方案

我相信最大长度不仅取决于浏览器，而且还上的Web服务器。例如，在Apache HTTP服务器有一个 LimitRequestBody指令允许从0字节到任何地方2GB价值的数据。

Is there a documented max to the length of the string data you can use in the send method of an XMLHttpRequest for the major browser implementations?

I am running into an issue with a JavaScript XMLHttpRequest Post failing in FireFox 3 when the data is over approx 3k. I was assuming the Post would behave the same as a conventional Form Post.

The W3C docs mention the data param of the send method is a DOMString but I am not sure how the major browsers implement that.

Here is a simplified version of my JavaScript, if bigText is over about 3k it fails, otherwise it works...

var xhReq = createXMLHttpRequest();

function createXMLHttpRequest() {
  try { return new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) {}
  try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch (e) {}
  try { return new XMLHttpRequest(); } catch(e) {}
  alert("XMLHttpRequest not supported");
  return null;
}

function mySubmit(id, bigText) {
  var url    = "SubmitPost.cfm";
  var params = "id=" + id + "&bigtext=" + encodeURI(bigText);

  xhReq.open("POST", url, true);

  //Send the header information along with the request
  xhReq.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  xhReq.setRequestHeader("Content-length", params.length);
  xhReq.setRequestHeader("Connection", "close");

  xhReq.onreadystatechange = onPostSubmit;
  xhReq.send(params);
}

function onPostSubmit() {

  if (xhReq.readyState==4 || xhReq.readyState=="complete")
     { 
     if (xhReq.status != 200)
        {
        alert('BadStatus');
        return;
        }
    } 
}

解决方案

I believe the maximum length depends not only on the browser, but also on the web server. For example, the Apache HTTP server has a LimitRequestBody directive which allows anywhere from 0 bytes to 2GB worth of data.

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