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RequestInterceptor.java
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/*
* Copyright 2013 Netflix, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package feign;
/**
* Zero or more {@code RequestInterceptors} may be configured for purposes such as adding headers to
* all requests. No guarantees are give with regards to the order that interceptors are applied.
* Once interceptors are applied, {@link Target#apply(RequestTemplate)} is called to create the
* immutable http request sent via {@link Client#execute(Request, feign.Request.Options)}. <br> <br>
* For example: <br>
* <pre>
* public void apply(RequestTemplate input) {
* input.replaceHeader("X-Auth", currentToken);
* }
* </pre>
* <br> <br><b>Configuration</b><br> <br> {@code RequestInterceptors} are configured via {@link
* Feign.Builder#requestInterceptors}. <br> <br><b>Implementation notes</b><br> <br> Do not add
* parameters, such as {@code /path/{foo}/bar } in your implementation of {@link
* #apply(RequestTemplate)}. <br> Interceptors are applied after the template's parameters are
* {@link RequestTemplate#resolve(java.util.Map) resolved}. This is to ensure that you can
* implement signatures are interceptors. <br> <br><br><b>Relationship to Retrofit 1.x</b><br> <br>
* This class is similar to {@code RequestInterceptor.intercept()}, except that the implementation
* can read, remove, or otherwise mutate any part of the request template.
*/
public interface RequestInterceptor {
/**
* Called for every request. Add data using methods on the supplied {@link RequestTemplate}.
*/
void apply(RequestTemplate template);
}