正常情况下，代理返回的头信息为： HTTP/1.1 200 OK server?? ? Apache-Coyote/1.1 content-type?? ?application/json; charset=UTF-8 transfer-encoding?? ?chunked date?? ? Tue, 28 Jun 2016 02:07:39 GMT connection?? ?close   然而在IE8下面却返回了下面的头信息： HTTP/1.1 406 Not Acceptable server: Apache-Coyote/1.1 set-cookie: JSESSIONID=7F367B9EB53FDC8306D807E0A7BD4201; Path=/; HttpOnly content-type: text/html; charset=utf-8 date: Tue, 28 Jun 2016 02:01:31 GMT connection: close Transfer-Encoding: chunked   通过对比头信息，在代理设置里做了一下判断，在低版本IE浏览器重新设置一下头信息。

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var browserSync = require('browser-sync');

var proxyMiddleware = require('http-proxy-middleware');

var proxy_context = ['/service/web'];
var proxy_option = {
    target: 'http://' + proxyConfig.host + ':' + proxyConfig.port,
    //增加一个错误处理在window 7 ie7,8
    onProxyReq: function(proxyReq, req, res) {
        var is4dot0 = false;
        var acceptValue = "";
        var acceptEncodeing = "";
        var rawHeaders = req.rawHeaders;

        rawHeaders.forEach(function(value, index) {
            if (value === "Accept") {
                acceptValue = rawHeaders[index + 1];
            }
            if (value === "Accept-Encoding") {
                acceptEncodeing = rawHeaders[index + 1];
            }
            if (value.indexOf("Mozilla/4.0") === 0) {
                is4dot0 = true;
            }
        });
        if (is4dot0) {
            proxyReq.setHeader("Accept", acceptValue);
            proxyReq.setHeader("Accept-Encoding", acceptEncodeing);
        }
    }
};
var proxy = proxyMiddleware(proxy_context, proxy_option);

browserSync({
    host: 'local.xxx.com',
    port: 3000,
    open: 'external',
    browser: 'google chrome',
    ghostMode: false, // 每个页面的镜像独立，不相互影响
    server: {
        baseDir: "build",
        middleware: [proxy]
    }
});