Missing signature referencing the top-level element about gosaml2 HOT 2 CLOSED

<?xml version="1.0"?>
<samlp:Response xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol" ID="_f7c18a563bada5a53a02" InResponseTo="_0db217fa-99a8-40ba-9de7-5840bd93e7d4" Version="2.0" IssueInstant="2019-11-12T10:48:45Z" Destination="http://localhost:8181/v1/_saml_callback">
  <saml:Issuer xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">http://example.com/saml/acs/example</saml:Issuer>
  <samlp:Status>
    <samlp:StatusCode Value="urn:oasis:names:tc:SAML:2.0:status:Success"/>
  </samlp:Status>
  <saml:Assertion xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" Version="2.0" ID="_zpFqVARey6JzaE6PqrO9ibve9ezQktsQ" IssueInstant="2019-11-12T10:48:45.961Z">
    <saml:Issuer>http://example.com/saml/acs/example</saml:Issuer>
    <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
      <SignedInfo>
        <CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
        <SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>
        <Reference URI="#_zpFqVARey6JzaE6PqrO9ibve9ezQktsQ">
          <Transforms>
            <Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
            <Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
          </Transforms>
          <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
          <DigestValue>HmLYbad7jtiGfak3ATYP895cgK8=</DigestValue>
        </Reference>
      </SignedInfo>
      <SignatureValue>ZNoVxGROREXS9OPfE9YhA4sqTkYDVtm1/F8x07AcAHjfMDzv2yZvxMb5k93LrZo1tOecc7h6IlaUfmeDBGDM/G6A+hm0BKZFdHlNZmXVSZnkhHF5thfjooo2mkUO1x3teDlBU167uqSEpUYvDUvPL6QDt87HEl2J88R2haKyBh+S2EbChACvhdHm8jjRLBIYuwVzHNBlxTxx7vQj+bcxJVgGkyGcu48qGatSwn/ZIpduExOnpj0RceXNl5B7rt3z0L83XeZ03xbEdQUKivmHPlKUOXmKXuo1ZwBSNF5PF9AKzYLs1AwVigl5wjleXOs+xWb6RUnVu3cK7EKxAIDl0g==</SignatureValue>
      <KeyInfo>
        <X509Data>
          <X509Certificate>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</X509Certificate>
        </X509Data>
      </KeyInfo>
    </Signature>
    <saml:Subject>
      <saml:NameID Format="urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified">[email protected]</saml:NameID>
      <saml:SubjectConfirmation Method="urn:oasis:names:tc:SAML:2.0:cm:bearer">
        <saml:SubjectConfirmationData NotOnOrAfter="2019-11-12T11:48:45.961Z" Recipient="http://localhost:8181/v1/_saml_callback" InResponseTo="_0db217fa-99a8-40ba-9de7-5840bd93e7d4"/>
      </saml:SubjectConfirmation>
    </saml:Subject>
    <saml:Conditions NotBefore="2019-11-12T10:48:45.961Z" NotOnOrAfter="2019-11-12T11:48:45.961Z">
      <saml:AudienceRestriction>
        <saml:Audience>http://example.com/saml/acs/example</saml:Audience>
      </saml:AudienceRestriction>
    </saml:Conditions>
    <saml:AttributeStatement xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
      <saml:Attribute Name="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress">
        <saml:AttributeValue xsi:type="xs:anyType">[email protected]</saml:AttributeValue>
      </saml:Attribute>
      <saml:Attribute Name="Email">
        <saml:AttributeValue xsi:type="xs:anyType">[email protected]</saml:AttributeValue>
      </saml:Attribute>
      <saml:Attribute Name="FirstName">
        <saml:AttributeValue xsi:type="xs:anyType">Charl</saml:AttributeValue>
      </saml:Attribute>
      <saml:Attribute Name="LastName">
        <saml:AttributeValue xsi:type="xs:anyType">Matthee</saml:AttributeValue>
      </saml:Attribute>
    </saml:AttributeStatement>
    <saml:AuthnStatement AuthnInstant="2019-11-12T10:48:45.961Z">
      <saml:AuthnContext>
        <saml:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:unspecified</saml:AuthnContextClassRef>
      </saml:AuthnContext>
    </saml:AuthnStatement>
  </saml:Assertion>
</samlp:Response>