Example usage for org.apache.http.client.methods CloseableHttpResponse setHeader

Introduction

In this page you can find the example usage for org.apache.http.client.methods CloseableHttpResponse setHeader.

Prototype

void setHeader(String str, String str2);

Source Link

Usage

From source file:org.esigate.cache.CacheAdapter.java

public ClientExecChain wrapBackendHttpClient(final ClientExecChain wrapped) {
    return new ClientExecChain() {

        private boolean isCacheableStatus(int statusCode) {
            return (statusCode == HttpStatus.SC_OK || statusCode == HttpStatus.SC_MOVED_PERMANENTLY
                    || statusCode == HttpStatus.SC_MOVED_TEMPORARILY || statusCode == HttpStatus.SC_NOT_FOUND
                    || statusCode == HttpStatus.SC_INTERNAL_SERVER_ERROR
                    || statusCode == HttpStatus.SC_SERVICE_UNAVAILABLE
                    || statusCode == HttpStatus.SC_NOT_MODIFIED || statusCode == HttpStatus.SC_GATEWAY_TIMEOUT);
        }// w w  w .j a v a  2s .c  om

        /**
         * Fire pre-fetch and post-fetch events Enables cache for all GET requests if cache ttl was forced to a
         * certain duration in the configuration. This is done even for non 200 return codes! This is a very
         * aggressive but efficient caching policy. Adds "stale-while-revalidate" and "stale-if-error" cache-control
         * directives depending on the configuration.
         * 
         * @throws HttpException
         * @throws IOException
         */
        @Override
        public CloseableHttpResponse execute(HttpRoute route, HttpRequestWrapper request,
                HttpClientContext httpClientContext, HttpExecutionAware execAware)
                throws IOException, HttpException {
            OutgoingRequestContext context = OutgoingRequestContext.adapt(httpClientContext);

            CloseableHttpResponse response = wrapped.execute(route, request, context, execAware);

            String method = request.getRequestLine().getMethod();
            int statusCode = response.getStatusLine().getStatusCode();

            // If ttl is set, force caching even for error pages
            if (ttl > 0 && method.equalsIgnoreCase("GET") && isCacheableStatus(statusCode)) {
                response.removeHeaders("Date");
                response.removeHeaders("Cache-control");
                response.removeHeaders("Expires");
                response.setHeader("Date", DateUtils.formatDate(new Date(System.currentTimeMillis())));
                response.setHeader("Cache-control", "public, max-age=" + ttl);
                response.setHeader("Expires",
                        DateUtils.formatDate(new Date(System.currentTimeMillis() + ((long) ttl) * 1000)));
            }
            if (request.getRequestLine().getMethod().equalsIgnoreCase("GET")) {
                String cacheControlHeader = "";
                if (staleWhileRevalidate > 0) {
                    cacheControlHeader += "stale-while-revalidate=" + staleWhileRevalidate;
                }
                if (staleIfError > 0) {
                    if (cacheControlHeader.length() > 0) {
                        cacheControlHeader += ",";
                    }
                    cacheControlHeader += "stale-if-error=" + staleIfError;
                }
                if (cacheControlHeader.length() > 0) {
                    response.addHeader("Cache-control", cacheControlHeader);
                }
            }

            return response;
        }

    };
}

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