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Using an existing web server vs writing your own
When writing a dynamic web service, you broadly speaking have two paths:
Use an existing web server (e.g. Apache, Nginx or Lighttpd) to handle the "raw" web requests and implement your own code as a separate process that communicates with the server using a gateway protocol (e.g. FastCGI). A typical PHP service is a great example of this.
Skip the general purpose web server altogether and write your program to handle the requests directly. Typically you would use some web framework which takes care of most technicalities. Services written in Rust tend to take this path.
My question is that if you are using a language that is generally suitable for implementing a standalone web server (such as Rust), is there any advantage with the first path? General pros and cons of both architectures are also welcome.