fix(android): crash on response headers

Author: farfromrefug

src/request.android.ts

@@ -496,16 +496,8 @@ export function createRequest(opts: HttpsRequestOptions, useLegacy: boolean = tr
                             const message = OkHttpResponse.getMessage(response);
                             const statusCode = OkHttpResponse.getStatusCode(response);
                             const getHeaders = function () {
-                                const heads = response.headers();
-                                const headers = {};
-                                // let heads: okhttp3.Headers = resp.headers();
-                                const len: number = heads.size();
-                                let i: number;
-                                for (i = 0; i < len; i++) {
-                                    const key = heads.name(i);
-                                    headers[key] = heads.value(i);
-                                }
-                                return headers;
+                                const heads = OkHttpResponse.getHeaders(response);
+                                return JSON.parse(heads);
                             };
                             if (useLegacy) {
                                 const nResponse = new OkHttpResponse(responseBody);

src/typings/android.d.ts

@@ -23,7 +23,8 @@ declare namespace com {
                 toFileAsync(filePath: string, callback: OkHttpResponse.OkHttpResponseAsyncCallback);
 
                 static getStatusCode(response: okhttp3.Response): number;
-                static getMessage(response: okhttp3.Response): String;
+                static getMessage(response: okhttp3.Response): string;
+                static getHeaders(response: okhttp3.Response): string;
             }
             export class ProgressRequestWrapper extends okhttp3.RequestBody {
                 constructor(body: okhttp3.RequestBody, listener: ProgressRequestWrapper.ProgressListener);