Translate cURL -d to Unity C# is throwing error 400 Bad Request

Question

Hi,

There's a web page where I want to make RESTful calls. However I am getting error 400 Bad Request. Testing from web page works just fine, however this error occurs only in unity.

cURL:

  curl -X POST "http://MyWebSite.net/api/User/Authorize" -H "accept: text/plain" -H "Content-Type: application/json" -d "{\"userId\":\"i8PSadEvWAeOPFASfegE7sEPQPQO2\"}"

And this is how I am translating this cURL command to unity C#:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.Networking;
 
 public class GameTest : MonoBehaviour
 {
     //I changed following url with some non-existent link, just for security reasons. 
     public string url = "http://MyWebSite.net/api/User/Authorize";
 
     // Start is called before the first frame update
     void Start()
     {
         StartCoroutine(PostRequest());
     }
 
     IEnumerator PostRequest()
     {
 
         WWWForm form = new WWWForm();
         
         //Uncommenting following line makes no difference
         //form.AddField("userId", "i8PSadEvWAeOPFASfegE7sEPQPQO2");
 
         using (UnityWebRequest www = UnityWebRequest.Post(url, form))
         {
             www.SetRequestHeader("accept", "text/plain");
             www.SetRequestHeader("Content-Type", "application/json");
 
             //Uncommenting following line makes no difference
             //www.SetRequestHeader("userId", "i8PSadEvWAeOPFASfegE7sEPQPQO2");
 
             yield return www.SendWebRequest();
 
             if (www.isNetworkError || www.isHttpError)
             {
                 Debug.LogError("ERROR: " + www.error);
             }
             else
             {
                 Debug.Log("Success");
             }
         }
     }
 }

I believe that I am not sending -d "{\"userId\":\"i8PSadEvWAeOPFASfegE7sEPQPQO2\"}" correctly from unity. Any help is appreciated.

Thanks

Answer 1

Fixed it :) For anyone having same issue, set www.uploadHandler to new object of type UploadHandlerRaw(System.Text.Encoding.UTF8.GetBytes(JsonObject)); (credits)

, and make sure to not send data with form, but send json instead.

Complete script:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.Networking;
 
 public class GameTest : MonoBehaviour
 {
     public string url = "http://MyWebsite.azurewebsites.net/api/User/Authorize";
 
     // Start is called before the first frame update
     void Start()
     {
         StartCoroutine(PostRequest());
     }
 
     IEnumerator PostRequest()
     {
 
         UserId user = new UserId
         {
             userId = "i234KfpsoAeOP2ODasdg532EPQPQO2"
         };
 
         string jsonText = JsonUtility.ToJson(user);
 
         using (UnityWebRequest www = UnityWebRequest.Post(url, jsonText))
         {
             www.SetRequestHeader("accept", "application/json");
             www.SetRequestHeader("Content-Type", "application/json");
 
             www.uploadHandler = new UploadHandlerRaw(System.Text.Encoding.UTF8.GetBytes(jsonText));
 
             yield return www.SendWebRequest();
 
             if (www.isNetworkError || www.isHttpError)
             {
                 Debug.LogError("ERROR title: " + www.error);
                 Debug.LogError("ERROR body: " + www.downloadHandler.text);
             }
             else
             {
                 Debug.Log("Success");
                 Debug.Log("Success body: " + www.downloadHandler.text);
             }
         }
     }
 }

Translate cURL -d to Unity C# is throwing error 400 Bad Request

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