headersFilter

Programming exercise for Citi vacancy

It is a problem, which must be presented every day in the micros that develop:

1. Imagine that you have to remove all the headers from the HttpServletRequest that arrives on a micro.

2. To get them they have to return an object of this type: Map <String, List >, where the key of that map represents the name of the header, and the value is a list of Strings, because List, because they can obtain more than one value for the same header (Check the HTTP specification)

3. To get a list of all the headers in a request, it can be done as follows: request.getHeaderNames ()

4. To obtain the value of a header you can obtain it in the following way: request.getHeaders (<>)

Write the code using functional or declarative programming, to take all the request headers and put them in an object of type Map <String, List >.

Additional:

• Write another method to return the same Map <String, List > object, but filtered with only the headings that you indicate, through a list of Strings.

• The parameters of this second method are: HttpServletRequest request, List headerNames, the return would be of type: Map <String, List >

Again, the code for both methods has to be programmatically functional.

It has to be efficient, and meet basic quality standards (include UnitTest in the mentioned use cases).

Having into account the following specifications, the following microservice was created

---

the next steps explain how to run this micro service

1. Clone this repository .

2. Open terminal and go to the directory and run the following command using maven (this micro run in port 9090).

        mvn clean install spring-boot:run 
   

3. Open Some programs to test the functionality of this micro, the routes exposed are:

http://localhost:9090/v1/api/headers/extraction

• this api is a GET request that returns a Map <String, List >.

http://localhost:9090/v1/api/headers/filter

• this api is a POST request that returns a map <String, List > filtering the headers that are requested.

to generate the uni test report use the following command

        mvn surefire-report:report

---

Created by: Alfonso Chavez Email: [email protected] | [email protected]