fix: 修复content-type未忽略大小写的Bug

src/core/service/api/network/request.js

@@ -100,7 +100,14 @@ class RequestTask {
 }
 
 export function request (args, callbackId) {
-  if (args.method !== 'GET' && args.header['Content-Type'].indexOf('application/json') === 0 && isPlainObject(args.data)) {
+  let contentType
+  for (const name in args.header) {
+    if (name.toLowerCase() === 'content-type') {
+      contentType = args.header[name]
+      break
+    }
+  }
+  if (args.method !== 'GET' && contentType.indexOf('application/json') === 0 && isPlainObject(args.data)) {
     args.data = JSON.stringify(args.data)
   }
   const {