我正在尝试使用image/png
标头提供base64字符串作为图像。标题设置正确,但图像没有显示所有我能看到的是一个空白屏幕。这是代码:
request('someCustomLink', function (error, response, body) {
// someCustomLink gives the base64 string
var img = new Buffer(body, 'base64');
res.writeHead(200, {
'Content-Type': 'image/png',
'Content-Length': img.length
});
res.end(img);
});
this是我为达到这个解决方案而遵循的链接。
任何帮助将不胜感激。
编辑以下是我的someCustomLink的响应标题(它可能有助于理解问题betr)
Accept-Ranges:bytes
Content-Length:128778
Content-Type:image-jpeg
Date:Thu, 21 Dec 2017 06:03:52 GMT
ETag:"edc04d469779108860478b361b7427d7"
Last-Modified:Mon, 11 Dec 2017 08:54:32 GMT
Server:AmazonS3
x-amz-id-2:QlR39g0vC5CeOo6fdKzX9uFB+uiOtj61c0LKW2rQLcCPWllcKyfbpg93Yido+vZfzMzB3lmhbNQ=
x-amz-request-id:3EC77634D9A05371
这是get req
var request = require('request').defaults({ encoding: null });
app.get('/thumb/:thumbLink', function(req, res) {
request('https://s3.amazonaws.com/my-trybucket/projectImages/'+req.params.thumbLink, function (error, response, body) {
//console.log('error:', error); // Print the error if one occurred
//console.log('statusCode:', response && response.statusCode); // Print the response status code if a response was received
//console.log('body:', body); // Print the HTML for the Google homepage.
var img = new Buffer(body, 'base64');
res.writeHead(200, {
'Content-Type': 'image/png'
});
res.end(img);
});
});
-谢谢
你得到的回应包含data:image/png;base64,
。你在创建Buffer
之前删除了它。见下面的例子
request('https://s3.amazonaws.com/my-trybucket/projectImages/e31492f7314837a22a64395eee7cedfd', function(error, response, body) {
var img = new Buffer(body.split(',')[1], 'base64');
res.writeHead(200, {
'Content-Type': 'image/png',
'Content-Length': img.length
});
res.end(img);
})