Getting 413 Error when calling Express Api from Swift - node.js

Question

When I try to access my Express endpoint that I made in node from my iOS app, I get a 413 error, saying that the payload is too large. Here is my Node code.
router.post('/images/tags/nutritionalInformation/image/base64encoded', function (req, res) {
var base64Stream = req.body.imageString;
var imgDecodedBuffer = decodeBase64Image(base64Stream);
// write to image file
var prefix = guid().toString() + ".jpg";
var filePath = './uploads/' + prefix;
return s3fsImpl.writeFile(prefix, imgDecodedBuffer.data).then(function () {
var s3BaseUrl = "https://s3.amazonaws.com/app/" + prefix;
console.log(s3BaseUrl);
app.models.predict('KEY', s3BaseUrl).then(
function (response) {
var responseJson = JSON.stringify(response.data.outputs[0].data.concepts);
var data = collectTags(responseJson);
data.then(function (value) {
res.json(value);
});
},
function (err) {
console.log(err);
});
});
})
I tested this out in postman and when I attach the base64 encoded string in the body, it works fine! However, when I try to send a POST call from Swift using the following Code :
func getTags() {
let image : UIImage = UIImage(named: "burger.jpg")!
let imageData = UIImageJPEGRepresentation(image, 1.0)
// base64 encode imagedata
let prefix = "data:image/jpeg;base64,"
let strBase64:String = prefix + (imageData?.base64EncodedString(options: .lineLength64Characters))!
// Call tagging api https://foodenodeapp.herokuapp.com/api/images/tags/nutritionalInformation/image/base64encoded
var request = URLRequest(url: URL(string: "https://foodenodeapp.herokuapp.com/api/images/tags/nutritionalInformation/image/base64encoded")!)
request.httpMethod = "POST"
let poststring = "imageString=" + strBase64
let task = URLSession.shared.dataTask(with: request) { data, response, error in
guard let data = data, error == nil else { // check for fundamental networking error
print("error=\(error)")
return
}
if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 { // check for http errors
print("statusCode should be 200, but is \(httpStatus.statusCode)")
print("response = \(response)")
}
print(data)
let responseString = String(data: data, encoding: .utf8)
print("responseString = \(responseString)")
}
task.resume()
}
However, when I print out the responseString in the Swift Code, I get this response:
nutritionalInformation/image/base64encoded } { status code: 413, headers {
Connection = "keep-alive";
"Content-Length" = 18;
"Content-Type" = "text/html; charset=utf-8";
Date = "Sun, 04 Dec 2016 20:18:15 GMT";
Server = Cowboy;
Via = "1.1 vegur";
"X-Content-Type-Options" = nosniff;
"X-Powered-By" = Express;
} }
18 bytes
responseString = Optional("Payload Too Large\n")
So I did some research and I tried changing my app.js, which is my root file (the logic code is in api.js).
app.use(bodyParser.json({limit: '50mb'}));
app.use(bodyParser.urlencoded({extended:true, limit: '50mb'}));
app.use(express.static(__dirname + '/public'));
app.get('/', function (req, res) {
res.redirect('/api');
});
app.use('/api', require('./routes/api'));
However, when after this change, when I run the function in Swift, I now get a 500 error.
Any help resolving this issue would be greatly appreciated!

Answer 1

This problem occurs from the server side.
If your server is Node JS then make changes as:-
var express = require('express')
var bodyParser = require('body-parser')
var app = express()
app.use(bodyParser.json({ limit: '10mb' })) // change limit according to you.
for other server change limit.