問題描述

對于主要瀏覽器實現，您可以在 XMLHttpRequest 的 send 方法中使用的字符串數據長度是否有文檔記錄?

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?

當數據超過大約 3k 時，我遇到了 JavaScript XMLHttpRequest Post 在 FireFox 3 中失敗的問題.我假設 Post 的行為與傳統的 Form Post 相同.

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.

W3C 文檔提到 send 方法的數據參數是 DOMString，但我不確定主流瀏覽器是如何實現的.

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.

這是我的 JavaScript 的簡化版本，如果 bigText 超過 3k 則失敗，否則它可以工作...

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;
        }
    } 
}

推薦答案

我相信最大長度不僅取決于瀏覽器，還取決于網絡服務器.例如，Apache HTTP 服務器有一個 LimitRequestBody 指令，它允許從 0 字節到 2GB 的數據.

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.

這篇關于XMLHttpRequest Post 上的 send() 數據參數的最大長度的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！