javascript 如何在 Node.js 中请求图像和输出图像
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How to request images and output image in Node.js
提问by kenticny
I try to get the image and display on a url. and I use requestmodule.
我尝试获取图像并显示在 url 上。我使用请求模块。
For example, I want to get the image https://www.google.com/images/srpr/logo11w.png, and display on my url http://example.com/google/logo.
例如，我想获取图像https://www.google.com/images/srpr/logo11w.png，并显示在我的 url 上http://example.com/google/logo。
Or display by <img src="http://example.com/google/logo" />.
或按 显示<img src="http://example.com/google/logo" />。
And I try to use requestand express:
我尝试使用request和express：
app.get("/google/logo", function(req, res) {
request.get("https://www.google.com/images/srpr/logo11w.png",
function(err, result, body) {
res.writeHead(200, {"Content-Type": "image/png"});
res.write(body);
res.end();
})
})
but the response is not a image. How to get image and output?
但响应不是图像。如何获取图像和输出？
Please give me some suggestion about the question. THANKS.
请给我一些关于这个问题的建议。谢谢。
回答by Darin Dimitrov
Try specifying encoding: nullwhen making the request so that the response body is a Bufferthat you can directly write to the response stream:
尝试encoding: null在发出请求时指定，以便响应正文是Buffer您可以直接写入响应流的：
app.get("/google/logo", function(req, res) {
var requestSettings = {
url: 'https://www.google.com/images/srpr/logo11w.png',
method: 'GET',
encoding: null
};
request(requestSettings, function(error, response, body) {
res.set('Content-Type', 'image/png');
res.send(body);
});
});
On the other hand if you do not specify encoding: null, the bodyparameter will be a String instead of a Buffer.
另一方面，如果您不指定encoding: null，则body参数将是字符串而不是缓冲区。
回答by Safi
That seems an overkill, you can just ask the browser the get the url directly like this;
这似乎有点矫枉过正，你可以像这样直接让浏览器获取 url；
app.get("/google/logo", function(req, res) {
res.writeHead(302, {location:"https://www.google.com/images/srpr/logo11w.png"});
res.end();
})
