Sending Multiple response for a request

Hi,
I have a HTML form and have used a post method to send the details in the form to my web service. Inside my web service, I perform a validation with the data received and send back a error message if the data received is not proper.
Suppose if the data is proper, I am querying a database and after all the processing is done,I am invoking a URL.
I just want to know a couple of things.
1.) In case the input data to my web service is fine, can I send back a response saying that the data receieved is proper and then continue with the other processing like querying the DB for the same request? I need to do the actual process also and then invoke a url in the end.
2.) If not, in case the input data is proper and after all the processing is done, can I inovke the url by using sendRedirect func of the response object and also finally return the status for that particular request?
Eg: public String FuncA(){
//Some processing with input data
try{
servletResponse.sendRedirect(URL);
return "Successfull"
Will the above one work? Like am invoking a URl using redirect and then finally am returning a message back. Will both the things together work? Both the url to which it is returned as well as the url given in the redirectmethod() is different.
Please provide some inputs.
Thanks in advance.

Hi,
I am using REST webservice. Also, currently there is no session being maintained or any request object. Currently, the input to the webservice will be obtained as a string value. After some processing with the input, I have to invoke the URl as well return a message to the one that calls this webservice.

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