XMLHttpRequest.overrideMimeType()

The XMLHttpRequest method overrideMimeType() specifies a MIME type other than the one provided by the server to be used instead when interpreting the data being transferred in a request. This may be used, for example, to force a stream to be treated and parsed as "text/xml", even if the server does not report it as such. This method must be called before calling send().

XMLHttpRequest 的 overrideMimeType 方法是指定一个MIME类型，被提供的类型替换原有默认类型，服务端解释请求中传输的数据按照该指定MIME类型处理。例如强制为流方式处理并作为"text/xml"解析时会被使用到，即使不通知服务器。此方法必须在send方法之前条用方为有效。例如:

// 强制设置成 content-type 为文件流。
               xhr.overrideMimeType && xhr.overrideMimeType('application/octet-stream');

Syntax

XMLHttpRequest.overrideMimeType(mimeType)

Parameters

mimeType

A DOMString specifying the MIME type to use instead of the one specified by the server. If the server doesn't specify a type, XMLHttpRequest assumes "text/xml".

Return value

undefined.

Example

This example specifies a MIME type of "text/plain", overriding the server's stated type for the data being received.

// Interpret the received data as plain text

req = new XMLHttpRequest();
req.overrideMimeType("text/plain");
req.addEventListener("load", callback, false);
req.open("get", url);
req.send();

Specifications

Browser compatibility

See also

• Using XMLHttpRequest
• XMLHttpRequest.responseType