fix: replace form data to url search params

Co-authored-by: imdudu1 <cd80@kakao.com>

Author: jbl428

lib/builders/payload.builder.ts

@@ -13,10 +13,6 @@ export class PayloadBuilder {
       return { 'Content-Type': 'application/json' };
     }
 
-    if (this.requestFormBuilder != null) {
-      return { 'Content-Type': 'application/x-www-form-urlencoded' };
-    }
-
     return undefined;
   }
 

lib/builders/request-form.builder.ts

@@ -16,8 +16,8 @@ export class RequestFormBuilder {
     this.metadata.push([index, [key, defaultValue]]);
   }
 
-  build(args: any[]): FormData {
-    const form = new FormData();
+  build(args: any[]): URLSearchParams {
+    const form = new URLSearchParams();
 
     this.metadata.forEach(([index, [key, defaultValue]]) => {
       if (key != null) {

lib/supports/node-fetch.injector.spec.ts

@@ -311,11 +311,10 @@ describe('NodeFetchInjector', () => {
 
     // then
     expect(httpClient.requestInfo).toHaveLength(1);
-    expect(await httpClient.requestInfo[0].text()).toContain(
-      `Content-Disposition: form-data; name="foo"`,
-    );
+    const formData = await httpClient.requestInfo[0].formData();
+    expect(formData.get('foo')).toBe('bar');
     expect(httpClient.requestInfo[0].headers.get('Content-Type')).toBe(
-      'application/x-www-form-urlencoded',
+      'application/x-www-form-urlencoded;charset=UTF-8',
     );
   });