fix(use): Set request readable encoding to utf-8

Closes #118

Author: enisdenjo

src/use/express.ts

@@ -132,6 +132,7 @@ function toRequest(
       }
       return new Promise<string>((resolve) => {
         let body = '';
+        req.setEncoding('utf-8');
         req.on('data', (chunk) => (body += chunk));
         req.on('end', () => resolve(body));
       });

src/use/http.ts

@@ -142,6 +142,7 @@ function toRequest(
     body: () =>
       new Promise<string>((resolve) => {
         let body = '';
+        req.setEncoding('utf-8');
         req.on('data', (chunk) => (body += chunk));
         req.on('end', () => resolve(body));
       }),

src/use/http2.ts

@@ -176,6 +176,7 @@ function toRequest(
     body: () =>
       new Promise<string>((resolve) => {
         let body = '';
+        req.setEncoding('utf-8');
         req.on('data', (chunk) => (body += chunk));
         req.on('end', () => resolve(body));
       }),

src/use/koa.ts

@@ -126,6 +126,7 @@ export function createHandler<Context extends OperationContext = undefined>(
           }
           return new Promise<string>((resolve) => {
             let body = '';
+            ctx.req.setEncoding('utf-8');
             ctx.req.on('data', (chunk) => (body += chunk));
             ctx.req.on('end', () => resolve(body));
           });