python 上传图片使用'application/json'

 def uploadMaterial(self, ad: Ad, params: dict) -> ReqResult:
    reqResult = self.getFielToken()
        if not reqResult.succ:
            return reqResult

        files = {
            "file": open(ad.materialLocalPath, "rb")
        }

        data = {
            'file_token': reqResult.result.get('file_token'),
            'asset_name': ad.planName,
        }

        method, url = self.getMethodUrl('uploadMaterial', None)
        reqResult = request.doReq(method, url, None, self.fielBuildHeader(), files, self.buildReqResult, data)



 def fielBuildHeader(self):
        access_token = self.getAccessTokenTwo(self.account_id, self.product, self.channel)
        return {'Authorization': 'Bearer ' + access_token, 'Accept': 'application/json'}