Develop REST API using PHP in server side.
How to return something in the HTTP response header?
For example, A=100.
How to make this information into HTTP response header, so the client application program
can get this A value in the Response Headers.
Nothing in an HTTP request can be trusted, including HTTP headers and form data. A form token is a tool that can be used to guard against request forgeries (CSRF). This article shows an improved approach to form tokens, making it more difficult to…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions.
Consider email address RFCs:
Look at HTML5 form input element (with type=email) regex pattern: