Modify RequestBody in spring gateway

php editor Apple introduces you how to modify the RequestBody in Spring Gateway. Spring Gateway is an API gateway based on the Spring framework, used to process and forward HTTP requests. In Spring Gateway, RequestBody is used to receive request body data sent by the client. If you need to modify the RequestBody, you can do it through a custom filter or interceptor. First, you need to create a custom filter or interceptor, and then obtain the request body data in the filter or interceptor and modify it. Finally, the modified data is set back to the request body for subsequent processing. In this way, the RequestBody can be modified in Spring Gateway.

Question content

I want to modify the requestbody before routing it to the given uri. Based on the documentation I'm using

org.springframework.cloud.gateway.filter.factory.rewrite.modifyrequestbodygatewayfilterfactory Modify the text. When starting my server, the server fails to start with the following error Cause: Element [spring.cloud.gateway.routes[0].filters[0].modifyrequestbody.class] is not bound. \n\nAction:\n\nUpdate the application's configuration\n","context":"Default"}

The following are sample filters and rewrite functions

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The following is the rewritten function

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The following is yaml

routes:
        - id: order-route-1
          uri: http://localhost:8999/
          predicates:
            - Path=/some/path1
            - Method=POST
          filters:
            - ModifyRequestBody:
                class: com.xyz.filters.SomeFilter
                value: application/json, application/xml
                enabled: true

Solution

There are some problems with your code:

1. No need for the somefilter class, just use modifyrequestbody directly from the routing configuration. If you really need it to do something that modifyrequestbody can't do, you have to make it a bean by adding @component.
2. Your yaml configuration syntax is incorrect. Please refer to the following revision:

      routes:
        - id: order-route-1
          uri: http://localhost:8999/
          predicates:
            - path=/some/path1
            - method=post
          filters:
            - name: modifyrequestbody
              args:
                inclass: com.xyz.filters.oldtype
                outclass: com.xyz.filters.newtype
                rewritefunction: com.xyz.filters.myrewritefunction
                contenttype: application/json

• inclass: The fully qualified class name representing the original request body structure.

• outclass: Represents the fully qualified class name of the modified request body structure.

• rewritefunction: Refers to the fully qualified class name that implements the rewritefunction interface, which is used to convert the request body from originaltype to newtype.

• contenttype (optional): Specify this parameter when you want to change the requested content type.

Assuming you want to convert oldtype to newtype, here is the implementation of rewritefunction:

public class MyRewriteFunction implements RewriteFunction<OldType, NewType> {

    @Override
    public Publisher<NewType> apply(ServerWebExchange exchange, OldType originalRequest) {
     
        NewType modifiedRequest = modifyRequest(originalRequest);
        return Mono.just(modifiedRequest);
    }
}

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