We have configured saml authentication on our Bitbucket server. When a user goes to Bitbucket login page(say https://bitbucket.xyz.com), user will be redirected to our IdP page to enter credentials and once authenticated, will be redirected to Bitbucket home page. 

Since there is no saml support for Bitbucket branch plugin, I have enabled an option in saml plugin to configure no saml login url (https://bitbucket.xyz.com/login?saml_sso=false) in bitbucket and configured the same in jenkins settings but Bitbucket branch source plugin fails to get repositories in project. Following error can be seen in pipeline scan log

looks like plugin doesn't like characters in URL bitbucket.xyz.com/login?saml_sso=false

error:

org.codehaus.jackson.JsonParseException: Unexpected character ('<' (code 60)): expected a valid value (number, String, array, object, 'true', 'false' or 'null')
at [Source: java.io.StringReader@181a2835; line: 1, column: 2]
at org.codehaus.jackson.JsonParser._constructError(JsonParser.java:1433)
at org.codehaus.jackson.impl.JsonParserMinimalBase._reportError(JsonParserMinimalBase.java:521)
at org.codehaus.jackson.impl.JsonParserMinimalBase._reportUnexpectedChar(JsonParserMinimalBase.java:442)
at org.codehaus.jackson.impl.ReaderBasedParser._handleUnexpectedValue(ReaderBasedParser.java:1198)
at org.codehaus.jackson.impl.ReaderBasedParser.nextToken(ReaderBasedParser.java:485)
at org.codehaus.jackson.map.ObjectMapper._initForReading(ObjectMapper.java:2770)
at org.codehaus.jackson.map.ObjectMapper._readMapAndClose(ObjectMapper.java:2718)
at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1886)
at com.cloudbees.jenkins.plugins.bitbucket.JsonParser.toJava(JsonParser.java:56)
at com.cloudbees.jenkins.plugins.bitbucket.JsonParser.toJava(JsonParser.java:48)
at com.cloudbees.jenkins.plugins.bitbucket.server.client.BitbucketServerAPIClient.getServerBranches(BitbucketServerAPIClient.java:470)
Caused: java.io.IOException: I/O error when accessing URL: /rest/api/1.0/projects/FIF/repos/demo/branches?start=0&limit=200

git source code plugin works fine because it authenticates with GIT_ASKPASS