小编Jak*_*tek的帖子

我想编程Node.js http代理,它将能够修改响应体.到目前为止我做到了这一点:

http = require('http'),
httpProxy = require('http-proxy');

var proxy = httpProxy.createProxyServer();
http.createServer( function (req, res){
    //here I want to change the body I guess
    proxy.web(req, res, {
        target: req.url
    });
}).listen(8013);

我试图使用res.write(),但它给了我一个错误"无法在发送后设置标题".好吧,我不想改变标题,我想改变身体.
我该如何改变身体？任何建议将不胜感激.

如何减少if..else这样的long语句？

if( strcmp( alnumToc, "log") == 0){
            ARGNUMCHECK( in, 1);
            mpfr_log( num, stack[j-1], MPFR_RNDN);
            CPYRES( 1);
        } else if( strcmp( alnumToc, "log2") == 0){
            ARGNUMCHECK( in, 1);
            mpfr_log2( num, stack[j-1], MPFR_RNDN);
            CPYRES( 1);
        } else if( strcmp( alnumToc, "log10") == 0){
            ARGNUMCHECK( in, 1);
            mpfr_log10( num, stack[j-1], MPFR_RNDN);
            CPYRES( 1);
        } else if( strcmp( alnumToc, "sqrt") == 0){
            ARGNUMCHECK( in, 1);
            mpfr_sqrt( num, stack[j-1], MPFR_RNDN);
            CPYRES( 1);
        } else if( strcmp( alnumToc, "cbrt") == 0){
            ARGNUMCHECK( in, 1);
            mpfr_cbrt( num, …