diff --git a/packages/altair-core/src/request/__snapshots__/response-builder.spec.ts.snap b/packages/altair-core/src/request/__snapshots__/response-builder.spec.ts.snap
index 42be56e4af..794775aa6c 100644
--- a/packages/altair-core/src/request/__snapshots__/response-builder.spec.ts.snap
+++ b/packages/altair-core/src/request/__snapshots__/response-builder.spec.ts.snap
@@ -169,6 +169,17 @@ exports[`response-builder concatenate strategy should concatenate the responses
 ]
 `;
 
+exports[`response-builder concatenate strategy should concatenate the responses and format the data if concatenated data is valid JSON 1`] = `
+[
+  {
+    "content": "{
+  "hello": "world"
+}",
+    "timestamp": 1718252802585,
+  },
+]
+`;
+
 exports[`response-builder patch strategy should gather all errors from all responses 1`] = `
 [
   {
diff --git a/packages/altair-core/src/request/handlers/http.spec.ts b/packages/altair-core/src/request/handlers/http.spec.ts
index 3d9fe5c963..17eb59762e 100644
--- a/packages/altair-core/src/request/handlers/http.spec.ts
+++ b/packages/altair-core/src/request/handlers/http.spec.ts
@@ -341,6 +341,57 @@ describe('HTTP handler', () => {
     ]);
   });
 
+
+  it('should properly handle normal unsuccessful HTTP GET requests', async () => {
+    const mockHandler = new MswMockRequestHandler(
+      'http://localhost:3000/graphql',
+      async () => {
+        return new Response('my data is not found', {
+          status: 404,
+        });
+      }
+    );
+    server.use(mockHandler);
+
+    const request: GraphQLRequestOptions = {
+      url: 'http://localhost:3000/graphql',
+      method: 'GET',
+      additionalParams: {
+        testData: [
+          {
+            hello: 'world',
+          },
+        ],
+      },
+      headers: [],
+      query: 'query { hello }',
+      variables: {},
+      selectedOperation: 'hello',
+    };
+
+    const httpHandler: GraphQLRequestHandler = new HttpRequestHandler();
+    const res = await testObserver(httpHandler.handle(request));
+
+    const receivedRequest = mockHandler.receivedRequest();
+    expect(receivedRequest?.url).toEqual(
+      'http://localhost:3000/graphql?query=query+%7B+hello+%7D&variables=%7B%7D&operationName=hello'
+    );
+    expect(receivedRequest?.body).toBeNull();
+
+    expect(res).toEqual([
+      expect.objectContaining({
+        ok: false,
+        data: 'my data is not found',
+        headers: expect.any(Object),
+        status: 404,
+        url: 'http://localhost:3000/graphql?query=query+%7B+hello+%7D&variables=%7B%7D&operationName=hello',
+        requestStartTimestamp: expect.any(Number),
+        requestEndTimestamp: expect.any(Number),
+        resopnseTimeMs: expect.any(Number),
+      }),
+    ]);
+  });
+
   it('should properly handle failed HTTP requests', async () => {
     const mockHandler = new MswMockRequestHandler(
       'http://localhost:3000/error',
diff --git a/packages/altair-core/src/request/handlers/http.ts b/packages/altair-core/src/request/handlers/http.ts
index 6f3e327346..e2c64e52a7 100644
--- a/packages/altair-core/src/request/handlers/http.ts
+++ b/packages/altair-core/src/request/handlers/http.ts
@@ -49,9 +49,10 @@ export class HttpRequestHandler implements GraphQLRequestHandler {
 
             if (!merosResponse.ok || !merosResponse.body) {
               //  don't handle streaming
+              const buffer = await merosResponse.arrayBuffer()
               return this.emitChunk(
                 merosResponse,
-                new Uint8Array(),
+                new Uint8Array(buffer),
                 true,
                 observer,
                 requestStartTime,
diff --git a/packages/altair-core/src/request/response-builder.spec.ts b/packages/altair-core/src/request/response-builder.spec.ts
index 6f123a3e1b..7300bd5c9d 100644
--- a/packages/altair-core/src/request/response-builder.spec.ts
+++ b/packages/altair-core/src/request/response-builder.spec.ts
@@ -161,6 +161,20 @@ describe('response-builder', () => {
       expect(res).toMatchSnapshot();
     });
 
+    it('should concatenate the responses and format the data if concatenated data is valid JSON', () => {
+      const res = buildResponse([
+        {
+          content: '{"hello":',
+          timestamp: 1718252802585
+        },
+        {
+          content: '"world"}',
+          timestamp: 1718252802585,
+        }
+      ])
+      expect(res).toMatchSnapshot();
+    });
+
     it('should return timestamp as 0 if no responses are provided', () => {
       const res = buildResponse([], MultiResponseStrategy.CONCATENATE);
       expect(res).toEqual([
diff --git a/packages/altair-core/src/request/response-builder.ts b/packages/altair-core/src/request/response-builder.ts
index 65cd3d9175..92c5d19561 100644
--- a/packages/altair-core/src/request/response-builder.ts
+++ b/packages/altair-core/src/request/response-builder.ts
@@ -92,9 +92,11 @@ export const buildResponse = (
 };
 
 const buildResponse__concatenate = (responses: QueryResponse[]): QueryResponse[] => {
+  const content = responses.map((r) => r.content).join('');
+  const parsedContent = parseJson(content, {defaultValue: null});
   return [
     {
-      content: responses.map((r) => r.content).join(''),
+      content: parsedContent ? JSON.stringify(parsedContent, null, 2) : content,
       timestamp: responses.at(-1)?.timestamp ?? 0,
     },
   ];