To send an HTTP POST request in Java, you can use the java.net.URL and java.net.HttpURLConnection classes. Here is an example of how you can use these classes to send a POST request:
The error message "Cannot modify header information - headers already sent" typically occurs when a PHP script attempts to send a cookie or redirect the user's browser to a different page, but some output has already been sent to the browser.
To create a simple HTTP server in Java using only the Java SE API, you can use the java.net package.
Here's a code snippet for making an HTTP GET request using the requests library in Python: