Detailed log display of openfeign call

# 0. explain
- We often need to show in detail when calling a service feign Log , Default feign The call is not the most detailed log output , Therefore, when debugging the program, you should turn on feign Detailed log display of .feign The processing of logs is very flexible and can be used for each feign Client specifies logging policy , Each client creates a logger By default logger Its name is feign It should be noted that ,feign The printing of the log will only DEBUG Level response .
- We can feign The client configures its own logger.lever object , tell feign Record those logs logger.lever There are several values
    `NONE   Don't log anything
    `BASIC Just record the request method ,url, Response status code and execution time
    `HEADERS Record Basic Level based , Recording requests and responses header
    `FULL Recording requests and responses header,body And metadata

# 1. Open log display 

feign.client.config.PRODUCTS.loggerLevel=full  # Open the specified service log display
#feign.client.config.default.loggerLevel=full  # Open the service log display globally
logging.level.com.leon.feignclients=debug    # Appoint feign Call the package where the client object is located , Must be debug Level

# 2. Test the service call and view the log