**UPDATE:** I have created a [video on sending multipart/form-data requests][1] to explain this better.

-------------------------------

Actually, [Postman][2] can do this. 

[![enter image description here][3]][3]

Full example:

[![enter image description here][4]][4]

You DON&#39;T need to add any headers, Postman will do this for you automatically.

[![enter image description here][5]][5]

Make sure you check the comment from @maxkoryukov

&gt; Be careful with explicit Content-Type header. Better - do not set it&#39;s
&gt; value, the Postman is smart enough to fill this header for you. BUT,
&gt; if you want to set the Content-Type: multipart/form-data - do not
&gt; forget about [boundary field][6].


  [1]: https://youtu.be/c07IsbSNqfI
  [2]: https://www.postman.com
  [3]: https://i.stack.imgur.com/955xK.png
  [4]: https://i.stack.imgur.com/cjZPw.png
  [5]: https://i.stack.imgur.com/DT7tH.png
  [6]: http://stackoverflow.com/a/20321259/1115187

The usual error is one tries to put `Content-Type: {multipart/form-data}` into the header of the post request. That will fail, it is best to let Postman do it for you. For example:

**Suggestion To Load Via Postman**
[![Body Part][1]][1]

**Fails If In Header**
[![Common Error][2]][2]


**Works**
[![should remove content type from the Header][3]][3]


  [1]: https://i.stack.imgur.com/kAIrb.png
  [2]: https://i.stack.imgur.com/vA0se.png
  [3]: https://i.stack.imgur.com/08wZj.png



Let&#39;s say that a class has a `public int counter` field that is accessed by multiple threads. This `int` is only incremented or decremented.

To increment this field, which approach should be used, and why?


 * `lock(this.locker) this.counter++;`,
 * `Interlocked.Increment(ref this.counter);`,
 * Change the access modifier of `counter` to `public volatile`.

Now that I&#39;ve discovered `volatile`, I&#39;ve been removing many `lock` statements and the use of `Interlocked`. But is there a reason not to do this?

Volatile vs. Interlocked vs. lock

I am going through some blogs on SpringSource and in one of the blogs, author is using `@Inject` and I suppose he can also use `@Autowired`.

Here is the piece of code:

`@Inject private CustomerOrderService customerOrderService;`

I am not sure about the difference between `@Inject` and `@Autowired` and would appreciate it if someone explained their difference and which one to use under what situation?

What is the difference between @Inject and @Autowired in Spring Framework? Which one to use under what condition?

I am currently using the Chrome Addon Postman - REST Client to easily create POST / GET request.

Now I want to debug an upload script and I am **looking for a way to make requests encoded as &quot;multipart/form-data&quot;** so that I can send also a file.



How to send multipart/form-data request using Postman

I am currently using the Chrome Addon Postman - REST Client to easily create POST / GET request.
Now I want to debug an upload script and I am looking for a way to make requests encoded as "multipart/form-data" so that I can send also a file.

Does anyone know how to use the `HttpClient` in .Net 4.5 with `multipart/form-data` upload? 

I couldn&#39;t find any examples on the internet.

C# HttpClient 4.5 multipart/form-data upload

I am developing Windows Phone 8 app. I want to upload SQLite database via PHP web service using HTTP POST request with MIME type multipart/form-data &amp; a string data called &quot;userid=SOME_ID&quot;. 

I don&#39;t want to use 3rd party libs like HttpClient, RestSharp or MyToolkit. I tried the below code but it doesn&#39;t upload the file &amp; also doesn&#39;t give me any errors. It&#39;s working fine in Android, PHP, etc so there&#39;s no issue in web service. Below is my given code (for WP8). what&#39;s wrong with it?

I&#39;ve googled and I&#39;m not getting specific for WP8

&lt;!-- language: lang-csharp --&gt;

    async void MainPage_Loaded(object sender, RoutedEventArgs e)
    {
        var file = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFileAsync(DBNAME);
        //Below line gives me file with 0 bytes, why? Should I use 
        //IsolatedStorageFile instead of StorageFile
        //var file = await ApplicationData.Current.LocalFolder.GetFileAsync(DBNAME);
        byte[] fileBytes = null;
        using (var stream = await file.OpenReadAsync())
        {
            fileBytes = new byte[stream.Size];
            using (var reader = new DataReader(stream))
            {
                await reader.LoadAsync((uint)stream.Size);
                reader.ReadBytes(fileBytes);
            }
        }
    
        //var res = await HttpPost(Util.UPLOAD_BACKUP, fileBytes);
        HttpPost(fileBytes);
    }

    private void HttpPost(byte[] file_bytes)
    {
        HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(&quot;http://www.myserver.com/upload.php&quot;);
        httpWebRequest.ContentType = &quot;multipart/form-data&quot;;
        httpWebRequest.Method = &quot;POST&quot;;
        var asyncResult = httpWebRequest.BeginGetRequestStream((ar) =&gt; { GetRequestStreamCallback(ar, file_bytes); }, httpWebRequest);  
    }
    
    private void GetRequestStreamCallback(IAsyncResult asynchronousResult, byte[] postData)  
    {
        //DON&#39;T KNOW HOW TO PASS &quot;userid=some_user_id&quot;  
        HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;  
        Stream postStream = request.EndGetRequestStream(asynchronousResult);  
        postStream.Write(postData, 0, postData.Length);  
        postStream.Close();  
        var asyncResult = request.BeginGetResponse(new AsyncCallback(GetResponseCallback), request);  
    }  
    
    private void GetResponseCallback(IAsyncResult asynchronousResult)  
    {  
        HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;  
        HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);  
        Stream streamResponse = response.GetResponseStream();  
        StreamReader streamRead = new StreamReader(streamResponse);  
        string responseString = streamRead.ReadToEnd();  
        streamResponse.Close();  
        streamRead.Close();  
        response.Close();  
    }  

I also tried to solve my problem in Windows 8 but it&#39;s also not working.

&lt;!-- language: lang-csharp --&gt;

    public async Task Upload(byte[] fileBytes)
    {
        using (var client = new HttpClient())
        {
            using (var content = new MultipartFormDataContent(&quot;Upload----&quot; + DateTime.Now.ToString(System.Globalization.CultureInfo.InvariantCulture)))
            {
                content.Add(new StreamContent(new MemoryStream(fileBytes)));
                //Not sure below line is true or not
                content.Add(new StringContent(&quot;userid=farhanW8&quot;));
                using (var message = await client.PostAsync(&quot;http://www.myserver.com/upload.php&quot;, content))
                {
                    var input = await message.Content.ReadAsStringAsync();
                }
            }
        }
    }

How to upload file to server with HTTP POST multipart/form-data?

How can I can convert my JS Object to `FormData`?

The reason why I want to do this is, I have an object that I constructed out of the ~100 form field values. 

    var item = {
       description: &#39;Some Item&#39;,
       price : &#39;0.00&#39;,
       srate : &#39;0.00&#39;,
       color : &#39;red&#39;,
       ...
       ...
    }

Now I am asked to add the upload file functionality to my form which, of-course is impossible via JSON and so I am planning on moving to `FormData`. So is there any way that I can convert my JS object to `FormData`?

Convert JS Object to form data

So this HTML code submits the data in the correct format for me.

	&lt;form action=&quot;https://www.example.com/register.php&quot; method=&quot;post&quot; enctype=&quot;multipart/form-data&quot;&gt;
		Name: &lt;input type=&quot;text&quot; name=&quot;userName&quot;&gt;&lt;BR /&gt;
		Email: &lt;input type=&quot;text&quot; name=&quot;userEmail&quot;&gt;&lt;BR /&gt;
		Password: &lt;input type=&quot;text&quot; name=&quot;userPassword&quot;&gt;&lt;BR /&gt;
		Avatar: &lt;input type=&quot;file&quot; name=&quot;avatar&quot;&gt;&lt;BR /&gt;
		&lt;input type=&quot;submit&quot;&gt;
	&lt;/form&gt;

I&#39;ve looked into a good number of articles on how to do a multipart/form-data POST on iOS, but none really explain what to do if there were normal parameters as well as the file upload.

Could you please help me with the code to POST this in Obj-C?

Thanks!

POST multipart/form-data with Objective-C

&gt; *Wrong question asked, see my update below*

I need to integrate my AngularJS Project with an existing RESTful API. These API consume POST request which `upload a file`, and also submit the form data in a request. Unfortunately, one of the form input requires to be in `Content-Type: Application/json`.

After search on the web, I could only `POST` with `Content-Type: multipart/form-data` in which each of the parts does not have a specific `MIME`. 
How can I compose my `multipart/form-data` with a different `MIME`  for each parts in Javascript?

    POST /api/v1/inventory
    Host: localhost:8000
    Origin: http://localhost:9000
    Content-Type: multipart/form-data; boundary=------border

    ------border
    Content-Disposition: form-data; name=&quot;owner&quot;
    
    john doe
    ------border
    Content-Disposition: form-data; name=&quot;image&quot;; filename=&quot;mybook.png&quot;
    Content-Type: image/png


    ------border
    Content-Disposition: form-data; name=&quot;items&quot;
    Content-Type: application/json

    {&quot;name&quot;: &quot;Book&quot;, &quot;quantity&quot;: &quot;12&quot;}
    ------border--

Relevant References:

 1. https://developer.mozilla.org/en-US/docs/Web/Guide/Using_FormData_Objects
 2. https://stackoverflow.com/questions/9081079/rest-http-post-multipart-with-json
 3. http://code.activestate.com/recipes/578846-composing-a-postable-http-request-with-multipartfo/
 4. https://stackoverflow.com/questions/4007969/application-x-www-form-urlencoded-or-multipart-form-data
 5. https://stackoverflow.com/a/9082243/764592

------------------------------------

# Update

Apologize for asking a wrong question. The original problem is that, I can see the server calling the logic something like, 

    func POST(req):
         owner = req.owner // This is string
         image = req.image // This is file object
         itemQuantity = req.items.quantity // Items is an object with attribute quantity
         itemName = req.items.name // Items is an object with attribute name
         
I have also managed to figure out how to submit such a post request. I will post my answer below. 

Once again sorry for asking a wrong question.


Content Type	Original Author	Original Content on Stackoverflow
Question	Valentin Despa	View Question on Stackoverflow
Solution 1 - Multipartform Data	Valentin Despa	View Answer on Stackoverflow
Solution 2 - Multipartform Data	Hung Vu	View Answer on Stackoverflow

How to send multipart/form-data request using Postman

Multipartform Data Problem Overview

Multipartform Data Solutions

Solution 1 - Multipartform Data

Solution 2 - Multipartform Data

What is the difference between @Inject and @Autowired in Spring Framework? Which one to use under what condition?

Volatile vs. Interlocked vs. lock

Attributions