Getting started with gateway

1.Gateway

SpringCloud The launch is based on WebFlux+Netty Of Reactor Responsive programming gateway components , Performance equivalent to Zuul More than double . Gateway can do many things in distributed microservice architecture ： Flow control 、 Log monitoring 、 Unified authentication authority verification, etc .

Gateway There is 3 An important concept ：

• Route route ： Routing information includes ID、URI、 The factory 、 A group of Filter.
• Predicates Assertion ： Check various conditions and parameters of the request , If it meets the conditions, it will be released .
• Filter filter ： Filtering chain processing of requests and responses .Gateway Of Filter Support Pre and Post Two modes .

2. Assertion

Gateway There are many built-in assertion types available ：

• After： Assertion Verification Based on time , Release only after the specified date .
• Before： and After contrary .
• Between： Release within a certain time .
• Cookie： Verify the specified Cookie, Qualified release .
• Header： Check request header .
• Host： Verify whether the matching current request comes from the set host address .
• Method： matching HTTP Request method , for example Post、Get etc. .
• Path： Match path .
• Query： Parameter matching verification .

3.Filter filter

Gateway Filter support for Pre Preprocessing and Post Post processing has two modes , We can also achieve Filter Interface comes from definition Gateway Filter , adopt Order Interface can realize filter sorting .
Gateway There are dozens of official built-in Filter,Filter Divided into two ：GatewayFilter、GlobalFilter. The difference is that the scope of the former is specific Route route , The latter belongs to global filtering . Generally speaking, we are used to GlobalFilter, It's covered with filter Method to implement the requested custom operation , Log for example 、 Certificate authority 、 add to Header Wait for the operation .