基于“接受”的有条件的网页服务标题与快递？ [英] Conditional serving of web pages based on "Accept" header with express?

问题描述

我知道您可以通过以下方式提供静态内容：

I understand that you can serve static content over express with:

app.use(express.static(__dirname + "../../../public_html"));

但是，我试图通过接受标题响应发送。通常，我通过REST API以JSON格式请求的内容，因此URL是： http://blah.com/this/that/item ，那很好，

However, I'm trying to have express change the presentation of the content it delivers based upon the "Accept" header the the response sends over. Normally, the content that I have is requested in a JSON format through a REST API so the url is: http://blah.com/this/that/item and that works well.

然而，我也希望用户能够从浏览器访问相同的页面，该浏览器将通过以下方式发送：接受：text / html 并且因为该标题，请查看格式正确的页面（CSS / JS / HTML / etc）来呈现相同的信息。

However, I would also like for users to be able to access that same page from a browser which would send over something like: Accept:text/html and because of that header, see a page with correct formatting (CSS/JS/HTML/etc) to present the same information.

现在，我试图通过以下方式提供内容：

Right now, I'm trying to serve the content through:

if (req.accepts("text/html")) {
   res.sendfile("/", {
      root: "../../../public_html"
   });
   res.status(200);
   return;
}

其中 public_html index.html 以及与CSS和JS相关的目录。我不会发送这个文件，只要这个完成，但我认为这将是一个好的开始，然后添加JSON内容，我想出了如何提供基于接受标题的静态内容。

Where public_html holds index.html and the relative directories with the CSS and JS. I won't send that file whenever this is finished, but I figured it would be a good start and then add the JSON content after I figured out how to serve static content based on the Accept header.

有更好的方法吗？

推荐答案

你在正确的轨道上。这是一个很好的示例，从Express关于使用req.accept：

You're on the right track. Here's a nice example from Express about using req.accept:

app.use(function(req, res, next){
  res.status(404);

  // respond with html page
  if (req.accepts('html')) {
    res.render('404', { url: req.url });
    return;
  }

  // respond with json
  if (req.accepts('json')) {
    res.send({ error: 'Not found' });
    return;
  }

  // default to plain-text. send()
  res.type('txt').send('Not found');
});

更新：

您可以使用res.send发送文件而不呈现：

You can use res.send to send files without rendering:

res.set('Content-Type', 'text/html');
res.send(new Buffer(fs.readFile(__dirname + 'index.html'));

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