callouts/java/service-callout/src/main/java/example/AddHeader.java [66:77]:
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    public void onRequestHeaders(ProcessingResponse.Builder processingResponseBuilder,
                                 HttpHeaders headers) {

        // Modify headers for the request
        addHeaderMutations(
                processingResponseBuilder.getRequestHeadersBuilder(),
                ImmutableMap.of("request-header", "added-request", "c", "d").entrySet(),  // Headers to add
                null,  // No headers to remove
                true,  // Clear route cache
                null   // No append action
        );
    }
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callouts/java/service-callout/src/main/java/example/BasicCalloutServer.java [71:82]:
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    public void onRequestHeaders(ProcessingResponse.Builder processingResponseBuilder,
                                 HttpHeaders headers) {

        // Modify headers for the request
        addHeaderMutations(
                processingResponseBuilder.getRequestHeadersBuilder(),
                ImmutableMap.of("request-header", "added-request", "c", "d").entrySet(),  // Headers to add
                null,  // No headers to remove
                true,  // Clear route cache
                null   // No append action
        );
    }
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