Why Post method of okhttp occur error [Content-Type header specified in HTTP request is not supported: application/x-www-form-urlencoded]?

Question

I call a Rest API of salesforce by post method:

url = "https://test-dev-ed.my.salesforce.com/services/apexrest/AccountUsers/"

    client = OkHttpClient()

     val jsonIn = FormBody.Builder()              

            .add("email",URLEncoder.encode("[email protected]", "UTF-8"))

            .add("password", URLEncoder.encode("1","UTF-8"))

            .build()

    request = Request.Builder()

            .post(jsonIn)

           .header("Authorization", "Bearer "+accesstoken)

           .addHeader("Content-Type","application/x-www-form-urlencoded")

           .url(url)

           .build()

        response = client.newCall(request).execute()

This is rest API:

@HttpPost

    global static ID createUser(String email, String password) {      

        AccountUser__c us=new AccountUser__c();

        us.Email__c=email;

        us.Password__c=password;      

        us.Status__c=0;

        insert us;      

        return us.Id;

    }  

But the result return is an error:

[{"errorCode":"UNSUPPORTED_MEDIA_TYPE","message":"Content-Type header specified in HTTP request is not supported: application/x-www-form-urlencoded"}]

I had to try to change application/json to application/x-www-form-urlencoded , but still can't resolve.

I try to call a Get method, it is ok.

Why Post method occur error [Content-Type header specified in the HTTP request is not supported]?

Answer 1

Even though it is not mandatory to use Retrofit, these are few eye-catchy aspects which make it reliable and handy in the similar use case of yours.

Why use Retrofit?

• Type-safe REST Adapter that makes common networking tasks easy
• For POST operations, retrofit helps in assembling what needed to be submitted. Eg:- Generating URL encoded form.
• Takes care of URL manipulation, requesting, loading, caching, threading, synchronization, sync/async calls
• Helps to generate URL using type-aware generated code tied to specific REST API
• Parsing JSON using GSON
• Retrofit is an API adapter wrapped over OkHttp

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