@java.lang.Override
      public int getSerializedSize() {
        int size = memoizedSize;
        if (size != -1) return size;

        size = 0;
        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(username_)) {
          size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, username_);
        }
        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(password_)) {
          size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, password_);
        }
        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(loginUrl_)) {
          size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, loginUrl_);
        }
        size += getUnknownFields().getSerializedSize();
        memoizedSize = size;
        return size;
      }
<pre>
Required. The login form URL of the website.
</pre>

<code>string login_url = 3 [(.google.api.field_behavior) = REQUIRED];</code>

@return The bytes for loginUrl.
java-websecurityscanner/proto-google-cloud-websecurityscanner-v1alpha/src/main/java/com/google/cloud/websecurityscanner/v1alpha/ScanConfig.java