An API is a contract between a caller and a callee. The most common forms of API abuse are caused by the caller failing to honor its end of this contract. For example, if a program fails to call chdir() after calling chroot(), it violates the contract that specifies how to change the active root directory in a secure fashion. Another good example of library abuse is expecting the callee to return trustworthy DNS information to the caller. In this case, the caller abuses the callee API by making certain assumptions about its behavior (that the return value can be used for authentication purposes). One can also violate the caller-callee contract from the other side. For example, if a coder subclasses SecureRandom and returns a non-random value, the contract is violated.
Code Correctness: Negative Content-Length
Content-Length header is set as negative.Content-Length header of a request indicates a developer is interested incommunicating the length of the POST data sent to the server. However, this header should be
0 or apositive integer.
Example 1: The following code will set an incorrect
Content-Length.
URL url = new URL("http://www.example.com");
HttpURLConnection huc = (HttpURLConnection)url.openConnection();
huc.setRequestProperty("Content-Length", "-1000");
Content-Length header is set as negative.Content-Length header of a request indicates a developer is interested incommunicating the length of the POST data sent to the server. However, this header should be
0 or apositive integer.
Example 1: The following code incorrectly sets the
Content-Length header as negative:
xhr.setRequestHeader("Content-Length", "-1000");