public/subjects/localhost/audit/README.md

Localhost is about creating your own HTTP server and test it with an actual browser.
##### Take the necessary time to understand the project and to test it, looking into the source code will help a lot.

### Functional

***Is the student able to justify his choices and explain the following:***

###### How does an HTTP server works?
###### Which function was used for I/O Multiplexing and how does it works?
###### Is the server using only one select (or equivalent) to read the client requests and write answers?
###### Why is it important to use only one select and how was it achieved?
###### Read the code that goes from the select (or equivalent) to the read and write of a client, is there only one read or write per client per select (or equivalent)?
###### Are the return values for I/O functions checked properly?
###### If an error is returned by the previous functions on a socket, is the client removed?
###### Is writing and reading ALWAYS done through a select (or equivalent)?

### Configuration file

Check the configuration file and modify it if necessary.
***Are the following configurations working properly:***
###### Setup a single server with a single port.
###### Setup multiple servers with different port.
###### Setup multiple servers with different hostnames (for example: curl --resolve test.com:80:127.0.0.1 http://test.com/).
###### Setup custom error pages.
###### Limit the client body (for example: curl -X POST -H "Content-Type: plain/text" --data "BODY with something shorter or longer than body limit").
###### Setup routes and ensure they are taken into account.
###### Setup a default file in case the path is a directory.
###### Setup a list of accepted methods for a route (for example: try to DELETE something with and without permission).

### Methods and cookies

***For each method be sure to check the status code (200, 404 etc):***
###### Are the GET requests working properly?
###### Are the POST requests working properly?
###### Are the DELETE requests working properly?
###### Test a WRONG request, is the server still working properly?
###### Upload some files to the server and get them back to test they were not corrupted.
###### A working session and cookies system is present on the server?

### Interaction with the browser

Open the browser used by the team during tests and its developer tools panel to help you with tests.
###### Is the browser connecting with the server with no issues?
###### Are the request and response headers correct? (It should serve a full static website without any problem).
###### Try a wrong URL on the server, is it handled properly?
###### Try to list a directory, is it handled properly?
###### Try a redirected URL, is it handled properly?
###### Check the implemented CGI, does it works properly with chunked and unchunked data?

### Port issues

###### Configure multiple ports and websites and ensure it is working as expected.
###### Configure the same port multiple times. The server should find the error.
###### Configure multiple servers at the same time with different configurations but with common ports. Ask why the server should work if one of the configurations isn't working.

### Siege & stress test

###### Use siege with a GET method on an empty page, availability should be at least 99.5% with the command `siege -b [IP]:[PORT]`.
###### Check if there is no memory leak (you could use some tools like top).
###### Check if there is no hanging connection.

#### General

###### +There's more than one CGI system such as [Python,C++,Perl].
###### +There is a second implementation of the server in a different language (repeat practical tests on it before to validate).