Implement CacheInterface, better JSON serialize

tests/httpBlock.test.ts

@@ -987,6 +987,45 @@ describe('http', <
             expect(result.result).toEqual(RESPONSE);
         });
 
+        it('application/json serialization', async() => {
+            const path = getPath();
+
+            const RESPONSE = {
+                text: 'Привет!',
+            };
+            fake.add(path, (req: ClientRequest, res: ServerResponse) => {
+                const buffer = Buffer.from(JSON.stringify(RESPONSE));
+                res.setHeader('content-length', Buffer.byteLength(buffer));
+                res.setHeader('content-type', 'application/json; charset=utf-8');
+                res.end(buffer);
+            });
+
+            const block = baseBlock({
+                block: {
+                    pathname: path,
+                },
+                options: {
+                    after: ({ result }: { result: DescriptHttpBlockResult<typeof RESPONSE> }) => JSON.stringify(result),
+                },
+            });
+
+            const result = await de.run(block);
+
+            expect(JSON.parse(result)).toEqual({
+                headers: {
+                    connection: 'keep-alive',
+                    'content-length': '24',
+                    'content-type': 'application/json; charset=utf-8',
+                    date: expect.stringMatching(/^.* GMT$/),
+                    'keep-alive': 'timeout=5',
+                },
+                result: {
+                    text: 'Привет!',
+                },
+                statusCode: 200,
+            });
+        });
+
         it('text/plain, is_json: true', async() => {
             const path = getPath();