1) curl -v -k http://localhost:8000/service_provider/login
2) Extracting the SAML message from the response:
    curl --user username:password -v  -k https://localhost:9443/samlsso?SAMLRequest=<ENCODED_REQUEST>

1.Get login form

Request
curl -v  http://localhost:8000/service_provider/login

Response
Extract SAMLRequest and SSOAuthSessionID (if RelayState presents extract it too)

2.Send saml request to IDP using extracted valuses in step1(In browser this will happen through redirection)

Request
Endpoint : https://<is_host>:9443/samlsso
Verb :post
Content-Type:application/x-www-form-urlencoded
Parameters:[
SAMLRequest:<value from previous step>,
SSOAuthSessionID:<value from previous step>,
RelayState :<value from previous step>]

Response
This will give IS login page.Extract sessionDataKey from that.

3. Login by providing user name password

Reqeust
Endpoint:https://<is_host>:9443/commonauth
Content-Type:application/x-www-form-urlencoded
Verb :post
Parameters: [tocommonauth:true,username:xxxx,password:xxx,sessionDataKey:<extracted from previous step>]

Response
Extract SAML response

5.Post the saml resposne to ACS url of service provider