POST call hangs without any response while checking the ColdFusion webservice - web-services

Question

I have created a REST service in ColdFusion with a POST. It takes input json from other application, checks them in my DB and returns the http status code. Simple.
Calling it from RESTClient-FireFox Plus from POSTMAN-Chrome, my application says it's success/failure depending upon authentication, but RESTClient hangs continuing to show the progress bar and the button Abort.
The GET works perfectly fine though. Can anyone please help?
GET - Works fine.
POST - Does not work.
Here is my webservice(cfc):
<cfcomponent rest="true" restpath="/AimsWeb"> <!--- REST Service--->
<cffunction name="AuthenticateUser" access="remote" httpmethod="POST" returntype="void">
<!---- Defining Arguments--->
<cfargument name="Username" type="string" required="Yes">
<cfargument name="Password" type="string" required="Yes">
<cfargument name="CustomerID" type="numeric" required="Yes">
<!---- Setting the Form Values (which we will get from AW+) and setting it to arguments passed--->
<cfset Form.CustomerID = arguments.CustomerID>
<cfset Form.Username = arguments.Username>
<cfset Form.Password = arguments.Password>
<!--- Take input json, parse it and set in in a variable --->
<cfscript>
record=deserializeJSON(
'{
"customerId": "#Form.CustomerID#",
"userName": "#Form.userName#",
"password": "#Form.Password#"
}'
);
this.customerid = record.customerId;
this.userName = record.userName;
this.password = record.password;
</cfscript>
<cfdump var="#record#">
<cfquery name="AllUsers" datasource="#Application.GomDatasource#">
SELECT u.UserTypeID, u.UserID, u.CustomerID, u.UserName, u.Password, u.active, u.locked
FROM tblUsers u
WHERE
u.username = 'swapnil'
</cfquery>
<!--- This is to check whether provided parameters are valid by checking the same in the database --->
<cfset local.StatusStruct = StructNew()>
<cflog text="in struct" type="information">
<cfif AllUsers.RecordCount AND (AllUsers.Active EQ 0 OR AllUsers.locked EQ 1)>
<cfheader statuscode="401" statustext="User Account is locked">
<cflog text="account locked" type="information">
<cfelse>
<cfif this.customerid EQ "" OR this.username EQ "" OR this.password EQ "">
<cfheader statuscode="400" statustext="Insufficient Input. Please provide Customer ID, UserName and Password">
<cflog text="insufficient input" type="information">
<cfelseif AllUsers.RecordCount AND (this.CustomerId EQ AllUsers.CustomerID AND this.username EQ AllUsers.UserName AND this.password EQ AllUsers.Password)>
<cfheader statuscode="200" statustext="Success">
<cflog text="success" type="information">
<cfelseif AllUsers.CustomerID NEQ this.CustomerID>
<cfheader statuscode="400" statustext="Customer Id doesn't exist">
<cflog text="customer id not exist" type="information">
<cfelseif AllUsers.UserName NEQ this.UserName>
<cfheader statuscode="400" statustext="User not found">
<cflog text="user name not found" type="information">
<cfoutput>
user name not found
</cfoutput>
<cfelseif AllUsers.Password NEQ this.password>
<cfheader statuscode="400" statustext="Invalid Password">
<cflog text="invalid password" type="information">
</cfif>
</cfif>
</cffunction>
</cfcomponent>
Here is the JSON I am passing as a Body:
{
"customerId": 100,
"userName": "test",
"password": "xxxxx"
}