fix(http): fix empty raw responses parsed as json

Author: fmauNeko

src/protocols/Http.ts

@@ -1,9 +1,9 @@
 "use strict";
 
-import staticHttpRoutes from "./routes.json";
-import { KuzzleAbstractProtocol } from "./abstract/Base";
 import { HttpRoutes, JSONObject } from "../types";
 import { RequestPayload } from "../types/RequestPayload";
+import { KuzzleAbstractProtocol } from "./abstract/Base";
+import staticHttpRoutes from "./routes.json";
 
 /**
  * Http protocol used to connect to a Kuzzle server.
@@ -405,6 +405,11 @@ export default class HttpProtocol extends KuzzleAbstractProtocol {
             );
           }
 
+          const contentType = response.headers["content-type"];
+          if (!contentType || !contentType.includes("application/json")) {
+            return response.body;
+          }
+
           return JSON.parse(response.body);
         });
     }
@@ -435,6 +440,11 @@ export default class HttpProtocol extends KuzzleAbstractProtocol {
 
       xhr.onload = () => {
         try {
+          const contentType = xhr.getResponseHeader("Content-Type");
+          if (!contentType || !contentType.includes("application/json")) {
+            resolve(xhr.responseText);
+            return;
+          }
           const json = JSON.parse(xhr.responseText);
           resolve(json);
         } catch (err) {

test/protocol/Http.test.js

@@ -677,9 +677,12 @@ describe("HTTP networking module", () => {
     let httpRequestStub;
 
     beforeEach(() => {
-      httpRequestStub = sinon
-        .stub()
-        .resolves({ body: JSON.stringify(mockResponseBody) });
+      httpRequestStub = sinon.stub().resolves({
+        body: JSON.stringify(mockResponseBody),
+        headers: {
+          "content-type": "application/json",
+        },
+      });
 
       const { default: MockHttp } = proxyquire("../../src/protocols/Http", {
         "min-req-promise": { request: httpRequestStub },
@@ -793,6 +796,7 @@ describe("HTTP networking module", () => {
         open: sinon.stub(),
         send: sinon.stub(),
         setRequestHeader: sinon.stub(),
+        getResponseHeader: sinon.stub().returns("application/json"),
         onreadystatechange: sinon.stub(),
         timeout: 0,
       };