Zap API中缺少参数username错误

这是我得到的输出:

5309955 [ZAP-ProxyThread-3963] INFO org.parosproxy.paros.control.Control  - New session file created
zap       | 5313051 [ZAP-ProxyThread-3971] INFO org.zaproxy.zap.authentication.ScriptBasedAuthenticationMethodType  - Loaded script for API:login.zst
zap       | 5313633 [ZAP-ProxyThread-3975] WARN org.zaproxy.zap.extension.api.API  - Bad request to API endpoint [/JSON/users/action/setAuthenticationCredentials/] from [10.254.0.6]:
zap       | Missing Parameter (missing_parameter) : Username

我就是这样提供auth参数的:

authmethod_params = ('scriptName=' + auth_script_name + '&'
                     'Submission Form URL={0}/{1}&'
                     'Username field=username&'
                     'Password field=password&'
                     'Target URL=http://www.example.com/login')
 # setup authentication
 auth = zap.authentication
 auth.set_authentication_method(
 contextid=context_id,
 authmethodname=auth_method_name,
 authmethodconfigparams=authmethod_params)

由于某种原因,API无法识别username参数,因此登录失败。你能提供一个 现在的 如何将基于脚本的身份验证的登录参数传递给Zap API的示例?

非常感谢