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We are using IISNODE to host our node application written using "hapi": "^16.5.2", the Route is pasted below

 
 method: 'POST',
 path: '/xxxx/xxxx/xxxx/Upload/',
 config: 
 auth: strategies: ['simple'] ,
 handler: uploadHandler.Upload,
 plugins: 
 'hapi-swagger': 
 responses: fileHTTPStatus,
 payloadType: 'form'
 ,
 disinfect: 
 disinfectQuery: false,
 disinfectParams: false,
 disinfectPayload: false
 ,
 policies: ['MethodAudit']
 ,
 tags: ['api'],
 validate: 
 payload: 
 file: Joi.any().meta( swaggerType: 'file' ).required().description('file')
 
 ,
 payload: 
 maxBytes: 209715200,
 parse: true,
 allow: 'multipart/form-data',
 output: 'stream'
 ,
 cors: 
 origin: ['*'],
 additionalHeaders: ['cache-control', 'x-requested-with', 'accept', 'authorization', 'content-type', 'if-none-match', 'origin', 'Accept-language']
 
 

uploadHandler.Upload Method looks like this:

function Upload (request, reply) 
if (request.payload) 
 var data = request.payload;

 if (data.file) 

 var originalName = data.file.hapi.filename;

 var path = rootDocPath + originalName; //rootDocPath is our common location

 var file = fs.createWriteStream(path);

 file.on('error', function (err) 
 console.error(err)
 );

 data.file.pipe(file);

 file.on('end', function() 
 console.log('file ended');
 );

 file.on('finish', function() 
 console.log('file finished');
 );

 data.file.on('end', function(err) 
 console.log('data.file ended');
 );

 file.on('close', function(err) 
 reply('Uploaded');
 );

 else 
 reply('no file')
 
 else 
 reply('no payload')

The response which we get is IIS 8.5 Detailed Error - 500.1013 - Internal Server Error

• While debugging we could see that reply("Uploaded") is being executed but the response is never received by the caller.


• This behaviour is only exhibited with larger files (more than 1.9
  MB), for smaller files it works 100%

Maybe there is something going on in your stream pipe.

Here is my dump uploader which uses promises I never had a single problem with it. Maybe you can compare with your process.

const fileUploader = function (file, targetPath) 
 if (!file) throw new Error('no file');
 const fileStream = fs.createWriteStream(targetPath);

 return new Promise((resolve, reject) => 
 file.on('error', function (err) 
 reject(err);
 );

 file.pipe(fileStream);

 file.on('end', function (err) 
 resolve(
 fieldname: file.hapi.name,
 originalname: file.hapi.filename,
 mimetype: file.hapi.headers['content-type'],
 targetPath,
 size: fs.statSync(targetPath).size,
 );
 )
 )
;

// usage
const filePath = await helpers.fileUploader(request.payload.data, targetPath);

The fix that worked for me was to set the request payload to null before sending a response back to the caller. Seems like if the request payload size is too large the service is unable to respond. Please see the fix below (look for the comment This is the FIX):

function Upload (request, reply) 
 if (request.payload) 
 var data = request.payload;

 if (data.file) 

 var originalName = data.file.hapi.filename;

 var path = rootDocPath + originalName; //rootDocPath is our common location

 var file = fs.createWriteStream(path);

 file.on('error', function (err) 
 console.error(err)
 );

 data.file.pipe(file);

 file.on('end', function() 
 console.log('file ended');
 );

 file.on('finish', function() 
 console.log('file finished');
 );

 data.file.on('end', function(err) 
 console.log('data.file ended');
 );

 file.on('close', function(err) 
 request.payload.file = null; /*This is the FIX*/
 reply('Uploaded');
 );

 else 
 reply('no file')
 
 else 
 reply('no payload')