UnityWebRequest GET with request body

Hi,
I need to access a REST API from Unity and some of the GET requests require a body. This is because these services perform queries that can accept parameters, and these are too complex to be passed on the URL.

I have tried to assign an UploadHandler to the request, but it looks like the body is not being sent to the server. I would like to know if the UploadHandler is always being ignored when executing a GET request, and if so, is there any other way I could do this?

Here's my GET coroutine:

Code (CSharp):

1. protected IEnumerator ExecuteGet(string resource, string jsonData)
2. {
3.         string url = getEndpoint() + resource;
4.         UnityWebRequest request = UnityWebRequest.Get(url);
5.         request.SetRequestHeader("Content-Type", "application/json");
6.  
7.         if (jsonData != null)
8.         {
9.             byte[] data = System.Text.Encoding.UTF8.GetBytes(jsonData);
10.             UploadHandlerRaw upHandler = new UploadHandlerRaw(data);
11.             upHandler.contentType = "application/json";
12.             request.uploadHandler = upHandler;
13.         }
14.      
15.         yield return request.Send();
16. }

Thank you.

 

Same here, I tried to achieve the same stuff without any success.
Don't have too much time to try more on it, I will wait for someone else answer

Cheers !

 

GET requests are not intended to have a body. Although it does not break the specifications since any HTTP operations is technically allowed to include a body payload, it goes against the recommendations. For that reason, I doubt the unity framework has built in support for including a body in GET requests.

Further reading:
http://stackoverflow.com/questions/978061/http-get-with-request-body

 

Thanks for the answer @eisenpony. Indeed, GET requests with a body don't seem to be supported so I ended up modifying the server side. I could finally encode all the filters in a way so that they can be passed as URL parameters.

Now I have encountered another issue though. I wanted to send a POST request with json as a body and this doesn't work either. I tried the same code as above but with the following modification:

Code (CSharp):

1. UnityWebRequest request = UnityWebRequest.Post(url, jsonData);

Unfortunately it looks like the method doesn't accept raw data. According to the documentation:

(Source: http://docs.unity3d.com/ScriptReference/Experimental.Networking.UnityWebRequest.Post.html)

On the other hand PUT requests do accept it. I find it weird that this is not supported for POST as well.

So my only choice seems to be to switch back to WWW, unless somebody knows of a workaround for this.

 

since you control both client and server side is it too difficult for you to send the json data in a wwwForm? if it is could you explain why?

 

Yep @MarioRuiz, that would be the other obvious solution. The only reason I would rather not do it (besides having to change all the methods on the server, since we have quite a few) is uniformity. I want to keep things simple and so I don't like the idea of having to encode things differently depending on whether I am updating or creating an object, it just complicates more the code. But I also don't like having to switch to WWW now, so.... I guess I'll have to give it a try. I was just reading about how to handle form parameters with Spring, which is what I am using on the server side

 

Hi, Took a while but this worked for me:

The Json in my example doesn't have quotes around type - maybe that is why it wasn't working.

Code (CSharp):

1.  WWWForm form = new WWWForm();
2.         // Username - this is irrelevent - needed for post request
3.         form.AddField("username", "name");
4.  
5.  
6.         UnityWebRequest wwwSignin = UnityWebRequest.Post(URL, form);
7.         Debug.Log("URL:" + URL);
8.  
9.         string jsonData = "";
10.         jsonData = "{Username:\"Pants\",Password:\"PantsLoveMe\"}";
11.  
12.         if (jsonData != null)
13.         {
14.             byte[] data = System.Text.Encoding.UTF8.GetBytes(jsonData);
15.  
16.             UploadHandlerRaw upHandler = new UploadHandlerRaw(data);
17.             upHandler.contentType = "application/json";
18.             wwwSignin.uploadHandler = upHandler;
19.         }
20.      
21.         yield return wwwSignin.Send();
22.  
23.         if (wwwSignin.isError)
24.         {
25.             Debug.Log(wwwSignin.error);
26.         }
27.         else
28.         {
29.             // Show results as text
30.             Debug.Log("Returning:" + wwwSignin.downloadHandler.text);
31.  
32.  
33.             //JSONObject j = new JSONObject(wwwSignin.downloadHandler.text);
34.          
35.         }

 

Hi McSwan. So with your solution both the form and the json are being sent in the request? I had tried sending either raw data or a form, but not both at the same time. Maybe that's the way to trick it.
I have it working now with the form solution but I will definitely give it a try. Thank you!

 

Has this changed since then? I don't control the server side and there is a GET request that has a request body that must be filled the following way:

Code (JavaScript):

1. [
2.   "string"
3. ]

Is it possible to do this using UnityWebRequest?

 

After 5 minutes of posting the question i managed to do it

My solution was the following:

Code (CSharp):

1.  
2.     public IEnumerator GetRequestWithBody(string url, string _json)
3.     {
4.         using (UnityWebRequest www = UnityWebRequest.Get(url))
5.         {
6.             //_json = "[\"" + _string + "\"]";
7.             www.SetRequestHeader("Content-Type", "application/json");
8.             www.SetRequestHeader("accept", "text/plain");
9.             www.uploadHandler = new UploadHandlerRaw(System.Text.Encoding.UTF8.GetBytes(_json));
10.             yield return www.SendWebRequest();
11.             if (www.isNetworkError)
12.             {
13.                 Debug.Log(www.error);
14.             }
15.             else
16.             {
17.                 if (www.isDone)
18.                 {
19.                     string jsonResult = System.Text.Encoding.UTF8.GetString(www.downloadHandler.data);
20.                
21.                 }
22.             }
23.         }

 

Frustratingly, GET body seems to work with UnityWebRequest from the editor, but I'm getting a null body when running the same code from WebGL

 

Freaking Javascript! Thanks for the clarification.

 

how does it work ,Can you show your code