nodejs 服务器中没有缓存
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no cache in a nodejs server
提问by user2986808
I have read that to avoid cache in nodejs it is necessary to use:
我已经读过，为了避免在 nodejs 中缓存，有必要使用：
"res.header('Cache-Control', 'no-cache, private, no-store, must-revalidate, max-stale=0, post-check=0, pre-check=0');"
But I don't know how to use it because I get errors when I put that line in my code.
但是我不知道如何使用它，因为当我将该行放入我的代码时会出错。
My function (where I think I have to program no cache) is:
我的功能（我认为我必须不编程缓存）是：
function getFile(localPath, mimeType, res) {
fs.readFile(localPath, function(err, contents) {
if (!err) {
res.writeHead(200, {
"Content-Type": mimeType,
"Content-Length": contents.length,
'Accept-Ranges': 'bytes',
});
//res.header('Cache-Control', 'no-cache');
res.end(contents);
} else {
res.writeHead(500);
res.end();
}
});
}
Does anyone know how to put no cache in my code? thanks
有谁知道如何在我的代码中不缓存？谢谢
采纳答案by Brad
You've already written your headers. I don't think you can add more after you've done that, so just put your headers in your first object.
您已经编写了标题。我不认为你在完成之后可以添加更多，所以只需将你的标题放在你的第一个对象中。
res.writeHead(200, {
'Content-Type': mimeType,
'Content-Length': contents.length,
'Accept-Ranges': 'bytes',
'Cache-Control': 'no-cache'
});
回答by vmx
Make use of a middleware to add no-cacheheaders. Use this middleware where-ever you intend to turn caching off.
使用中间件来添加no-cache标头。在您打算关闭缓存的任何地方使用此中间件。
function nocache(req, res, next) {
res.header('Cache-Control', 'private, no-cache, no-store, must-revalidate');
res.header('Expires', '-1');
res.header('Pragma', 'no-cache');
next();
}
Use the middleware in your routes definition:
在路由定义中使用中间件：
app.get('/getfile', nocache, sendContent);
function sendContent(req, res) {
var localPath = 'some-file';
var mimeType = '';
fs.readFile(localPath, 'utf8', function (err, contents) {
if (!err && contents) {
res.header('Content-Type', mimeType);
res.header('Content-Length', contents.length);
res.end(contents);
} else {
res.writeHead(500);
res.end();
}
});
}
Let me know if this works for you.
让我知道这是否适合您。
回答by Pylinux
Set these headers on your response:
在您的响应中设置这些标头：
'Cache-Control': 'private, no-cache, no-store, must-revalidate'
'Expires': '-1'
'Pragma': 'no-cache'
If you use express you can add this middleware to have no cache on all requests:
如果你使用 express 你可以添加这个中间件来对所有请求都没有缓存：
// var app = express()
app.use(function (req, res, next) {
res.header('Cache-Control', 'private, no-cache, no-store, must-revalidate');
res.header('Expires', '-1');
res.header('Pragma', 'no-cache');
next()
});
回答by Lanil Marasinghe
You can use nocacheMiddleware to turn off caching.
您可以使用nocache中间件来关闭缓存。
npm install --save nocache
Apply the middleware to your app
将中间件应用于您的应用
const nocache = require('nocache');
...
app.use(nocache());
This disables browser caching.
这将禁用浏览器缓存。
回答by bmw15
Pylinux's answer worked for me, but upon further inspection, I found the helmet module for express that handles some other security features for you.
Pylinux 的回答对我有用，但经过进一步检查，我发现 express 的头盔模块可以为您处理其他一些安全功能。
http://webapplog.com/express-js-security-tips/
http://webapplog.com/express-js-security-tips/
To use, install and require helmet in express.js, then call app.use(helmet.noCache());
要在 express.js 中使用、安装和需要头盔，然后调用 app.use(helmet.noCache());
回答by Dale Anderson
After spelunking through source code for the express and fresh modules, this works from the server side (before res.end is called):
在深入了解 express 和 fresh 模块的源代码后，这在服务器端起作用（在调用 res.end 之前）：
req.headers['if-modified-since'] = undefined;
req.headers['if-none-match'] = undefined;
Nasty, but it works.
讨厌，但它有效。
