How do I get Response body when there is an error when using Retrofit 2.0 Observables

Question

I am using Retrofit 2.0 to make api calls that return Observables. It all works good when the call went through fine and the response is as expected. Now let\'s say we have an e

Answer 1

You can add this code block to display the error message.

@Override
public void onFailure(Throwable t) {

 if (t instanceof HttpException) {
        ResponseBody body = ((HttpException) t).response().errorBody();
        Gson gson = new Gson();
        TypeAdapter<ErrorParser> adapter = gson.getAdapter
                (ErrorParser
                        .class);
        try {
            ErrorParser errorParser =
                    adapter.fromJson(body.string());

            Logger.i(TAG, "Error:" + errorParser.getError());

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Answer 2

Retrofit returns the Throwable Object which is a type of HttpException. First Step that you need to do is that you should know the structure of you error body object. Will show how to do it Kotlin. Once you know the structure, you need to create Error.kt file like shown below :

package com.test.test.qr.data.network.responsemodel
import com.google.gson.annotations.SerializedName

data class Error(
    @SerializedName("code")
    val code: String,
    @SerializedName("message")
    val message: String
)

Now you need to parse the body from HttpException to Error.Kt you created. This can be done as shown below :

if(it is HttpException) {
    val body = it.response()?.errorBody()
    val gson = Gson()
    val adapter: TypeAdapter<Error> = gson.getAdapter(Error::class.java)
    try {
        val error: Error = adapter.fromJson(body?.string())
        Log.d("test", " code = " + error.code + " message = " + error.message)
    } catch (e: IOException) {
       Log.d("test", " Error in parsing")
    }
}

Where it is the Throwable you get in onError() from retrofit. Hope it helps. Happy Coding...:-)

Answer 3

Just check if the throwable is an instance of HttpException and then you can access the retrofit response

if (e instanceof HttpException) {
    ResponseBody body = ((HttpException) e).response().errorBody();
    ...
}

Then you can use the converter to deserialize it (or do it yourself).