Example usage for org.apache.http.client.cache HeaderConstants PRAGMA

Introduction

In this page you can find the example usage for org.apache.http.client.cache HeaderConstants PRAGMA.

Prototype

String PRAGMA

To view the source code for org.apache.http.client.cache HeaderConstants PRAGMA.

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Usage

From source file:org.apache.http.impl.client.cache.CacheableRequestPolicy.java

/**
 * Determines if an HttpRequest can be served from the cache.
 *
 * @param request/*from  w ww  .j  a  va2s.  c  o  m*/
 *            an HttpRequest
 * @return boolean Is it possible to serve this request from cache
 */
public boolean isServableFromCache(HttpRequest request) {
    String method = request.getRequestLine().getMethod();

    ProtocolVersion pv = request.getRequestLine().getProtocolVersion();
    if (HttpVersion.HTTP_1_1.compareToVersion(pv) != 0) {
        log.debug("Request was not serveable from cache");
        return false;
    }

    if (!method.equals(HeaderConstants.GET_METHOD)) {
        log.debug("Request was not serveable from cache");
        return false;
    }

    if (request.getHeaders(HeaderConstants.PRAGMA).length > 0) {
        log.debug("Request was not serveable from cache");
        return false;
    }

    Header[] cacheControlHeaders = request.getHeaders(HeaderConstants.CACHE_CONTROL);
    for (Header cacheControl : cacheControlHeaders) {
        for (HeaderElement cacheControlElement : cacheControl.getElements()) {
            if (HeaderConstants.CACHE_CONTROL_NO_STORE.equalsIgnoreCase(cacheControlElement.getName())) {
                log.debug("Request was not serveable from Cache");
                return false;
            }

            if (HeaderConstants.CACHE_CONTROL_NO_CACHE.equalsIgnoreCase(cacheControlElement.getName())) {
                log.debug("Request was not serveable from cache");
                return false;
            }
        }
    }

    log.debug("Request was serveable from cache");
    return true;
}

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