Multer silent crash on uploading

When trying to upload a file of 143KB I receive the following error:

Bad Gateway

The proxy server received an invalid response from an upstream server. Apache/2.4.10 (Debian) Server at 50.116.34.26 Port 80

When trying to upload a file of 4KB I receive one of the two, randomly:

Proxy Error

The proxy server received an invalid response from an upstream server. The proxy server could not handle the request POST /grimoireworks/admin/uploads/uploadimage.

Reason: Error reading from remote server

or

Service Unavailable

The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later. Apache/2.4.10 (Debian) Server at 50.116.34.26 Port 80

this is the code I’m using on the route:

app.post('/admin/uploads/uploadimage',
	ajaxAdminLoggedIn,
	upload.single('image_file'),
	function(req, res, next) {
		console.log("start of upload");

		req.socket.setTimeout(10000);

		var supportedTypes = ['image/jpeg', 'image/png', 'image/gif'];
		var type = req.file.mimetype;//mime.lookup(req.files.image_file.path);

		console.log("before supportedTypes check");

		if (supportedTypes.indexOf(type) == -1) {
			fs.unlink(req.file.path);
			return res.send(415, 'Supported image formats: jpeg, jpg, jpe, gif, png.');
		}

		console.log("before targetPath");

		var targetPath = __dirname + '/public/images/';
		if (req.body.image_type == "wizard") {
			targetPath += 'classes/';
		} else if (req.body.image_type == "spell") {
			targetPath += 'spells/';
		} else {
			fs.unlink(req.file.path);
			return res.send(415, 'Invalid image type.');
		}

		console.log("before tempPath");

		var tempPath = req.file.path;

		console.log("before createReadStream");

		var source = fs.createReadStream(tempPath);
		var dest = fs.createWriteStream(targetPath + req.file.originalname);

		console.log(tempPath);
		console.log(targetPath + req.file.originalname);

		source.pipe(dest);

		console.log("after pipe");

		source.on('error', function(err) {
			if (err) {
				return res.send(500, 'Something went wrong');
			}
		});

		source.on('end', function() {
			//delete file from temp folder
			fs.unlink(tempPath, function(err) {
				if (err) {
					return res.send(500, 'Something went wrong');
				}

				res.redirect('back');
			}); //#end - unlink
		}); //#end - on.end
	}
);

This is the form

<form action="<%= relativePath %>/admin/uploads/uploadimage" method="post" enctype="multipart/form-data">
							<div class="form-group">
								<p>Select the type of the image:</p>
								<label>
									<input type="radio" name="image_type" id="image_type_wizard" value="wizard" checked>
									Wizard
								</label>
								<br>
								<label>
									<input type="radio" name="image_type" id="image_type_spell" value="spell">
									Spell
								</label>
							</div>
							<div class="form-group">
								<label for="image_file">Select your image:</label>
								<input type="file" name="image_file" id="image_file" />
								<p class="help-block">Supported files: jpg, jpeg, gif, png.</p>
							</div>
							<div class="text-right">
								<button type="submit" class="btn btn-success">Submit</button>
							</div>
						</form>

Besides this multer is just using this:

var bodyParser = require( 'body-parser' );
var multer  = require('multer');

No logs appear anywhere, the node application restarts when trying to upload a file.

Apache just shows:

[Sun Apr 16 22:40:11.299511 2017] [proxy_http:error] [pid 29899] (20014)Internal error: [client 189.35.245.253:7512] AH01102: error reading status line from remote server 127.0.0.1:6161, referer: http://50.116.34.26/grimoireworks/admin/uploads [Sun Apr 16 22:40:11.527747 2017] [proxy:error] [pid 29900] (111)Connection refused: AH00957: HTTP: attempt to connect to 127.0.0.1:6161 (127.0.0.1) failed [Sun Apr 16 22:40:11.527800 2017] [proxy:error] [pid 29900] AH00959: ap_proxy_connect_backend disabling worker for (127.0.0.1) for 60s [Sun Apr 16 22:40:11.527806 2017] [proxy_http:error] [pid 29900] [client 189.35.245.253:7519] AH01114: HTTP: failed to make connection to backend: 127.0.0.1, referer: http://50.116.34.26/grimoireworks/admin/uploads

[iLyxa3D]

For the record, turns out, there was no crash 😃 PM2 watched the changes in the folder and rebuild the application automatically - looks like crash restarting without error log. Excluding the download folder from the list of the watch (pm2 … --ignore-watch “folder_name”) stoped restarting.

[ayanth]

@iLyxa3D Thank you so much! Been digging around to resolve this issue for a while. So many technologies… so many different possiblities.

But in the end it was all from watch.

Thank you again!