I wanted to use if condition, but in order to do that i need to remove static keyword, but Http method are supposed to be static.
How can i solve this???


@RestResource(urlMapping='/sendPDFEmail/*')
Global class GETPDFContent{
     @HttpPost
    global static void sendEmail(String EmailIdCSV, String Subject, String body,string newID,string attachmentfilename,string ArticleTitle,string ArticleType) {
    List<String> EmailIds = EmailIdCSV.split(',');
        if(ArticleType=='Multi_Topic_PDF__kav'){
            PageReference ref = Page.Multi_Topic_PDF; 
          }      
            ref.getParameters().put('id',newID); 
            ref.setRedirect(true);
        Blob b = ref.getContentAsPDF();

        Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage();

        Messaging.EmailFileAttachment efa1 = new Messaging.EmailFileAttachment();
        efa1.setFileName(attachmentfilename);
        efa1.setBody(b);

        String addresses;
        email.setSubject( Subject );
        email.setToAddresses(EmailIds);
        email.setPlainTextBody(Body);
        email.setFileAttachments(new Messaging.EmailFileAttachment[] {efa1});
        Messaging.SendEmailResult [] r = Messaging.sendEmail(new Messaging.SingleEmailMessage[] {email});

    }
}