fix: ignore set body after user set status

packages/web-koa/src/framework.ts

@@ -81,11 +81,11 @@ export abstract class MidwayKoaBaseFramework<
       const controller = await ctx.requestContext.getAsync(controllerId);
       // eslint-disable-next-line prefer-spread
       const result = await controller[methodName].apply(controller, args);
-      if (result) {
+      if (result !== undefined) {
         ctx.body = result;
       }
 
-      if (!ctx.body) {
+      if (ctx.body === undefined && !(ctx.response as any)._explicitStatus) {
         ctx.body = undefined;
       }
 

packages/web-koa/test/fixtures/base-app/src/controller/case.ts

@@ -0,0 +1,41 @@
+import { Get, Provide, Controller, Inject } from '@midwayjs/decorator';
+
+@Provide()
+@Controller('/case')
+export class CaseController {
+
+  @Inject()
+  ctx;
+
+  @Get('/500')
+  async status500() {
+    this.ctx.status = 500;
+  }
+
+  @Get('/500_1')
+  async status500_1() {
+    this.ctx.status = 500;
+    return '';
+  }
+
+  @Get('/204')
+  async status204() {
+    this.ctx.status = 204;
+  }
+
+  @Get('/204_1')
+  async status204_1() {
+    this.ctx.status = 204;
+    return '';
+  }
+
+  @Get('/204_2')
+  async status204_2() {
+  }
+
+  @Get('/204_3')
+  async status204_3() {
+    this.ctx.status = 500;
+    this.ctx.body = undefined;
+  }
+}

packages/web-koa/test/index.test.ts

@@ -43,6 +43,36 @@ describe('/test/feature.test.ts', () => {
       const result = await createHttpRequest(app).get('/ctx-body');
       expect(result.text).toEqual('ctx-body');
     });
+
+    describe('test 500', function () {
+      it('test status 500', async () => {
+        const result = await createHttpRequest(app).get('/case/500');
+        expect(result.status).toBe(500);
+      });
+
+      it('test status 500_1', async () => {
+        const result = await createHttpRequest(app).get('/case/500');
+        expect(result.status).toBe(500);
+      });
+
+    });
+
+    describe('test 204', function () {
+      it('test status 204', async () => {
+        const result = await createHttpRequest(app).get('/case/204');
+        expect(result.status).toBe(204);
+      });
+
+      it('test status 204_1', async () => {
+        const result = await createHttpRequest(app).get('/case/204_1');
+        expect(result.status).toBe(204);
+      });
+
+      it('test status 204_2', async () => {
+        const result = await createHttpRequest(app).get('/case/204_2');
+        expect(result.status).toBe(204);
+      });
+    });
   });
 
 });