What should i learn to be able to code loadable modules for nginx that uses openssl API ?

Question

i want to help code an nginx loadable module for tls extension implementation of certificate transparency or say for Apache traffic server. what are the topics i must learn for that ?

any good book which explains in depth the use of openssl API in C ?

Answer 1

Those module is not a standard library c, so it cannot be used with online compilers such as Sololearn