fix: 解决 H5 端 GET 请求之前出现 OPTIONS 预检请求的问题

src/core/helpers/protocol/network/request.js

@@ -77,8 +77,12 @@ export const request = {
   header: {
     type: Object,
     validator (value, params) {
-      params.header = value || {}
-      params.header['content-type'] = params.header['content-type'] || 'application/json'
+      const header = params.header = value || {}
+      if (params.method !== method.GET) {
+        if (Object.keys(header).filter(key => key.toLowerCase() === 'content-type')) {
+          header['Content-Type'] = 'application/json'
+        }
+      }
     }
   },
   dataType: {

src/platforms/h5/service/api/network/request.js

@@ -70,13 +70,6 @@ export function request ({
     }
   }
   if (method !== 'GET') {
-    if (!contentType) {
-      /**
-       * 跨域时部分服务器OPTION响应头Access-Control-Allow-Headers未包含Content-Type会请求失败
-       */
-      header['Content-Type'] = 'application/json'
-      contentType = 'json'
-    }
     if (typeof data === 'string' || data instanceof ArrayBuffer) {
       body = data
     } else {