API B2C自定义策略中的API调用失败或API关闭的自定义错误消息

Question

我正在集成一个rest API，用于验证自定义策略中的字段。如果我的API关闭，则默认情况下会显示一条消息，但这不是用户友好的。有什么方法可以自定义错误消息。我正在关注此文档以进行其余API集成 Rest API integration

<ClaimsProvider>
  <DisplayName>REST APIs</DisplayName>
  <TechnicalProfiles>

    <!-- Custom Restful service -->
    <TechnicalProfile Id="REST-API-SignUp">
      <DisplayName>Validate user's input data and return loyaltyNumber claim</DisplayName>
      <Protocol Name="Proprietary" Handler="Web.TPEngine.Providers.RestfulProvider, Web.TPEngine, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
      <Metadata>
        <Item Key="ServiceUrl">https://your-app-name.azurewebsites.NET/api/identity/signup</Item>
        <Item Key="SendClaimsIn">Body</Item>
        <!-- Set AuthenticationType to Basic or ClientCertificate in production environments -->
        <Item Key="AuthenticationType">None</Item>
        <!-- REMOVE the following line in production environments -->
        <Item Key="AllowInsecureAuthInProduction">true</Item>
      </Metadata>
      <InputClaims>
        <InputClaim ClaimTypeReferenceId="email" />
        <InputClaim ClaimTypeReferenceId="givenName" PartnerClaimType="firstName" />
        <InputClaim ClaimTypeReferenceId="surname" PartnerClaimType="lastName" />
      </InputClaims>
      <OutputClaims>
        <OutputClaim ClaimTypeReferenceId="loyaltyNumber" PartnerClaimType="loyaltyNumber" />
      </OutputClaims>
      <UseTechnicalProfileForSessionManagement ReferenceId="SM-Noop" />
    </TechnicalProfile>

    <!-- Change LocalAccountSignUpWithLogonEmail technical profile to support your validation technical profile -->
    <TechnicalProfile Id="LocalAccountSignUpWithLogonEmail">
      <OutputClaims>
        <OutputClaim ClaimTypeReferenceId="loyaltyNumber" PartnerClaimType="loyaltyNumber" />
      </OutputClaims>
      <ValidationTechnicalProfiles>
        <ValidationTechnicalProfile ReferenceId="REST-API-SignUp" />
      </ValidationTechnicalProfiles>
    </TechnicalProfile>
  </TechnicalProfiles>
</ClaimsProvider>