I try to use Heroku as a layer of for flickr api because GFW has blocked flickr, and perhaps other public api in the future. I can run the index.js on a local environment or on AWS, but failed to run on Heroku. I did a bit of research and it looks like Heroku only support HTTP server as it has a layer outside of the dyno. So I wrote my code as followed:
var http = require('http');
var qs = require('querystring');
var curl = require('request');
var Port = 80;
var httpServer = http.createServer(app).listen(Port);
function app(request, response) {
if(request.method === "GET") {
response.writeHead(401, {'Content-Type': 'text/html'});
response.write('<!doctype html><html><head><title>401</title></head><body>401: Unauthorized</body></html>');
response.end();
} else if(request.method === "POST") {
if (request.url === "/") {
var requestBody = '';
request.on('data', function(data) {
requestBody += data;
if(requestBody.length > 1e7) {
response.writeHead(413, 'Request Entity Too Large', {'Content-Type': 'text/html'});
response.end('413: Request Entity Too Large');
}
});
request.on('end', function() {
var formData = qs.parse(requestBody);
if (formData.request === 'list') {
var url = 'https://api.flickr.com/services/rest/?method=flickr.photosets.getList&api_key=&user_id=&format=json';
} else if (formData.request === 'photoset') {
var url = 'https://api.flickr.com/services/rest/?method=flickr.photosets.getPhotos&photoset_id=' + formData.id + '&api_key=&user_id=&extras=url_o&format=json';
} else {
response.writeHead(400, 'Bad Request', {'Content-Type': 'text/html'});
response.end('400: Bad Request');
return;
}
getrequest(url, (err, body)=>{
if (err) {
response.writeHead(502, 'Bad Gateway', {'Content-Type': 'text/html'});
response.end('502: Bad Gateway');
} else {
response.writeHead(200, {'Content-Type': 'text/html'});
response.write(body);
response.end();
}
});
});
} else {
response.writeHead(404, 'Resource Not Found', {'Content-Type': 'text/html'});
response.end('<!doctype html><html><head><title>404</title></head><body>404: Resource Not Found</body></html>');
}
} else {
response.writeHead(405, 'Method Not Supported', {'Content-Type': 'text/html'});
return response.end('<!doctype html><html><head><title>405</title></head><body>405: Method Not Supported</body></html>');
}
};
function getrequest(url, callback){
curl(url, (error, response, body) => {
if (error) {
callback(error);
return;
}
callback(null, body);
});
}
The autobuild completed but I get 506 error when I sent POST request to my dyno's url. When I run heroku run node index.js it throws the following err message:
events.js:160
throw er; // Unhandled 'error' event
^
Error: listen EACCES 0.0.0.0:80
at Object.exports._errnoException (util.js:1018:11)
at exports._exceptionWithHostPort (util.js:1041:20)
at Server._listen2 (net.js:1245:19)
at listen (net.js:1294:10)
at Server.listen (net.js:1390:5)
at Object.<anonymous> (/app/index.js:5:41)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
via Aero Wang
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