Javascript從節點/快遞服務器讀取gz文件

Question

.NET服務將* .gz文件導出到nodejs服務器。這些文件是gziped json字符串。

這是本地保存文件的節點路由。

router.post("/", function (req, res) { 
    var filePath = path.join(__dirname, "../public", "data", req.header("filename")); 
    var writeStream = fs.createWriteStream(filePath); 
    req.pipe(writeStream); 
    req.on("end", function() { 
     writeStream.close(); 
     res.sendStatus(200); 
    }); 
}); 

現在我在我的公共/數據目錄中有.gz文件。

我要求從客戶端JS那樣的文件：

static fetchJsonFile(path:string, callback:Function):void { 
    let httpRequest = new XMLHttpRequest(); 
    httpRequest.onreadystatechange = function() { 
     if (httpRequest.readyState === 4) { 
      if (httpRequest.status === 200) { 
       let data = JSON.parse(httpRequest.response); 
       if (callback) 
        callback("OK", data); 
      } 
      else if (httpRequest.status === 404) { 
       if (callback) 
        callback("Resource not found", null); 
      } 
     } 
    }; 
    httpRequest.open("GET", path, true); 
    httpRequest.responseType = "json"; 
    httpRequest.send(); 
} 

它不工作 - 回報httpRequest.response == NULL。然而，服務器日誌顯示文件送達：GET /data/EURUSD1440.gz 200 1.352 ms - 322044 編輯當我設置httpRequest.responseType等於"text"，該httpRequest.response接收壓縮的文件，不能被解析。

如何讓客戶端讀取，解壓縮和解析gzip文件？

我嘗試了很多變種都沒有成功。我的一些嘗試的：

連接並連接，用gzip靜態：

connect().use(gzipStatic(path.join(__dirname, "public"))); 

隨着fs在routes/data.js：

router.get("/", function (req, res) { 
    var filePath = path.join(__dirname, "../public", "data", req.header("filename")); 
    console.log(filePath); 

    var readStream = fs.createReadStream(filePath); 
    res.setHeader("Content-Type", "application/json"); 
    res.setHeader("Content-Encoding", "gzip"); 
    res.setHeader("Vary", "Accept-Encoding"); 
    res.setHeader("Content-Disposition","gzip"); 

    readStream.on("open", function() { 
     readStream.pipe(res); 
    }); 

    readStream.on("end", function() { 
     readStream.close(); 
     console.log("there will be no more data."); 
    }); 

    readStream.on("error", function(err) { 
     res.end(err); 
    }); 
}); 

不幸的是，我沒有成功。有任何想法嗎？

編輯

它看起來像我無法正確設置響應頭沙爹內容被gzip壓縮。我的服務器主循環看起來像這樣：

"use strict"; 

var debug = require("debug")("Ea_Studio:server"); 
var http = require("http"); 
var express = require("express"); 
var path = require("path"); 
var favicon = require("serve-favicon"); 
var logger = require("morgan"); 
var bodyParser = require("body-parser"); 
var fs = require("fs"); 
var routes = require("./routes/index"); 
var data = require("./routes/data"); 

var app = express(); 

app.use(logger("dev")); 

app.use(favicon(path.join(__dirname, "public", "favicon.ico"))); 
app.use(bodyParser.json()); 
app.use(bodyParser.urlencoded({extended: false})); 
app.use(express.static(path.join(__dirname, "public"))); 

// view engine setup 
app.set("views", path.join(__dirname, "views")); 
app.set("view engine", "jade"); 


app.use("/", routes); 
app.use("/data", data); 

它看起來像GET請求不被routes/data.js

Answer 1

我管理使用serve-static模塊來解決它的管理。它允許我爲public/data路線設置gzip標題。

app.use(serveStatic(__dirname + "/public/data", {setHeaders: setDataFilesHeaders})); 
function setDataFilesHeaders(res) { 
    res.setHeader("Content-Type", "application/json"); 
    res.setHeader("Content-Encoding", "gzip"); 
    res.setHeader("Content-Disposition", "gzip"); 
} 

app.use(serveStatic(__dirname + "/public"));