List of usage examples for org.apache.http.client.cache HeaderConstants ETAG
String ETAG
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From source file:org.apache.http.impl.client.cache.BasicHttpCache.java
private void addVariantWithEtag(String variantKey, String variantCacheKey, Map<String, Variant> variants) throws IOException { HttpCacheEntry entry = storage.getEntry(variantCacheKey); if (entry == null) return;/* w w w. jav a 2 s . c om*/ Header etagHeader = entry.getFirstHeader(HeaderConstants.ETAG); if (etagHeader == null) return; variants.put(etagHeader.getValue(), new Variant(variantKey, variantCacheKey, entry)); }
From source file:org.apache.http.impl.client.cache.CachedResponseSuitabilityChecker.java
/** * Check entry against If-None-Match/* w w w .j a va2 s. c o m*/ * @param request * @param entry * @return */ private boolean etagValidtorMatches(HttpRequest request, HttpCacheEntry entry) { Header etagHeader = entry.getFirstHeader(HeaderConstants.ETAG); String etag = (etagHeader != null) ? etagHeader.getValue() : null; Header[] ifNoneMatch = request.getHeaders(HeaderConstants.IF_NONE_MATCH); if (ifNoneMatch != null) { for (Header h : ifNoneMatch) { for (HeaderElement elt : h.getElements()) { String reqEtag = elt.toString(); if (("*".equals(reqEtag) && etag != null) || reqEtag.equals(etag)) { return true; } } } } return false; }
From source file:org.apache.http.impl.client.cache.CachingExec.java
CloseableHttpResponse negotiateResponseFromVariants(final HttpRoute route, final HttpRequestWrapper request, final HttpClientContext context, final HttpExecutionAware execAware, final Map<String, Variant> variants) throws IOException, HttpException { final HttpRequestWrapper conditionalRequest = conditionalRequestBuilder .buildConditionalRequestFromVariants(request, variants); final Date requestDate = getCurrentDate(); final CloseableHttpResponse backendResponse = backend.execute(route, conditionalRequest, context, execAware);//from w w w. ja v a 2s. c om try { final Date responseDate = getCurrentDate(); backendResponse.addHeader("Via", generateViaHeader(backendResponse)); if (backendResponse.getStatusLine().getStatusCode() != HttpStatus.SC_NOT_MODIFIED) { return handleBackendResponse(route, request, context, execAware, requestDate, responseDate, backendResponse); } final Header resultEtagHeader = backendResponse.getFirstHeader(HeaderConstants.ETAG); if (resultEtagHeader == null) { log.warn("304 response did not contain ETag"); IOUtils.consume(backendResponse.getEntity()); backendResponse.close(); return callBackend(route, request, context, execAware); } final String resultEtag = resultEtagHeader.getValue(); final Variant matchingVariant = variants.get(resultEtag); if (matchingVariant == null) { log.debug("304 response did not contain ETag matching one sent in If-None-Match"); IOUtils.consume(backendResponse.getEntity()); backendResponse.close(); return callBackend(route, request, context, execAware); } final HttpCacheEntry matchedEntry = matchingVariant.getEntry(); if (revalidationResponseIsTooOld(backendResponse, matchedEntry)) { IOUtils.consume(backendResponse.getEntity()); backendResponse.close(); return retryRequestUnconditionally(route, request, context, execAware, matchedEntry); } recordCacheUpdate(context); final HttpCacheEntry responseEntry = getUpdatedVariantEntry(context.getTargetHost(), conditionalRequest, requestDate, responseDate, backendResponse, matchingVariant, matchedEntry); backendResponse.close(); final CloseableHttpResponse resp = responseGenerator.generateResponse(responseEntry); tryToUpdateVariantMap(context.getTargetHost(), request, matchingVariant); if (shouldSendNotModifiedResponse(request, responseEntry)) { return responseGenerator.generateNotModifiedResponse(responseEntry); } return resp; } catch (final IOException ex) { backendResponse.close(); throw ex; } catch (final RuntimeException ex) { backendResponse.close(); throw ex; } }
From source file:org.apache.http.impl.client.cache.CachingHttpAsyncClient.java
void negotiateResponseFromVariants(final BasicFuture<HttpResponse> future, final HttpHost target, final HttpRequestWrapper request, final HttpCacheContext clientContext, final Map<String, Variant> variants) { final HttpRequest conditionalRequest = this.conditionalRequestBuilder .buildConditionalRequestFromVariants(request, variants); final Date requestDate = getCurrentDate(); final ChainedFutureCallback<HttpResponse> chainedFutureCallback = new ChainedFutureCallback<HttpResponse>( future) {/*from w ww. ja v a 2 s .co m*/ @Override public void completed(final HttpResponse httpResponse) { final Date responseDate = getCurrentDate(); httpResponse.addHeader(HeaderConstants.VIA, generateViaHeader(httpResponse)); if (httpResponse.getStatusLine().getStatusCode() != HttpStatus.SC_NOT_MODIFIED) { try { future.completed(handleBackendResponse(target, request, requestDate, responseDate, Proxies.enhanceResponse(httpResponse))); return; } catch (final IOException e) { future.failed(e); return; } } final Header resultEtagHeader = httpResponse.getFirstHeader(HeaderConstants.ETAG); if (resultEtagHeader == null) { CachingHttpAsyncClient.this.log.warn("304 response did not contain ETag"); callBackend(future, target, request, clientContext); return; } final String resultEtag = resultEtagHeader.getValue(); final Variant matchingVariant = variants.get(resultEtag); if (matchingVariant == null) { CachingHttpAsyncClient.this.log .debug("304 response did not contain ETag matching one sent in If-None-Match"); callBackend(future, target, request, clientContext); } final HttpCacheEntry matchedEntry = matchingVariant.getEntry(); if (revalidationResponseIsTooOld(httpResponse, matchedEntry)) { EntityUtils.consumeQuietly(httpResponse.getEntity()); retryRequestUnconditionally(future, target, request, clientContext, matchedEntry); return; } recordCacheUpdate(clientContext); final HttpCacheEntry responseEntry = getUpdatedVariantEntry(target, conditionalRequest, requestDate, responseDate, httpResponse, matchingVariant, matchedEntry); final HttpResponse resp = CachingHttpAsyncClient.this.responseGenerator.generateResponse(request, responseEntry); tryToUpdateVariantMap(target, request, matchingVariant); if (shouldSendNotModifiedResponse(request, responseEntry)) { future.completed(CachingHttpAsyncClient.this.responseGenerator .generateNotModifiedResponse(responseEntry)); return; } future.completed(resp); } }; this.backend.execute(target, conditionalRequest, clientContext, chainedFutureCallback); }
From source file:org.apache.http.impl.client.cache.CachingHttpClient.java
HttpResponse negotiateResponseFromVariants(HttpHost target, HttpRequest request, HttpContext context,
Map<String, Variant> variants) throws IOException {
HttpRequest conditionalRequest = conditionalRequestBuilder.buildConditionalRequestFromVariants(request,
variants);//from ww w. j a v a 2 s .c o m
Date requestDate = getCurrentDate();
HttpResponse backendResponse = backend.execute(target, conditionalRequest, context);
Date responseDate = getCurrentDate();
backendResponse.addHeader("Via", generateViaHeader(backendResponse));
if (backendResponse.getStatusLine().getStatusCode() != HttpStatus.SC_NOT_MODIFIED) {
return handleBackendResponse(target, request, requestDate, responseDate, backendResponse);
}
Header resultEtagHeader = backendResponse.getFirstHeader(HeaderConstants.ETAG);
if (resultEtagHeader == null) {
log.warn("304 response did not contain ETag");
return callBackend(target, request, context);
}
String resultEtag = resultEtagHeader.getValue();
Variant matchingVariant = variants.get(resultEtag);
if (matchingVariant == null) {
log.debug("304 response did not contain ETag matching one sent in If-None-Match");
return callBackend(target, request, context);
}
HttpCacheEntry matchedEntry = matchingVariant.getEntry();
if (revalidationResponseIsTooOld(backendResponse, matchedEntry)) {
return retryRequestUnconditionally(target, request, context, matchedEntry);
}
recordCacheUpdate(context);
HttpCacheEntry responseEntry = getUpdatedVariantEntry(target, conditionalRequest, requestDate, responseDate,
backendResponse, matchingVariant, matchedEntry);
HttpResponse resp = responseGenerator.generateResponse(responseEntry);
tryToUpdateVariantMap(target, request, matchingVariant);
if (shouldSendNotModifiedResponse(request, responseEntry)) {
return responseGenerator.generateNotModifiedResponse(responseEntry);
}
return resp;
}
From source file:org.apache.http.impl.client.cache.ConditionalRequestBuilder.java
/** * When a {@link HttpCacheEntry} is stale but 'might' be used as a response * to an {@link HttpRequest} we will attempt to revalidate the entry with * the origin. Build the origin {@link HttpRequest} here and return it. * * @param request the original request from the caller * @param cacheEntry the entry that needs to be revalidated * @return the wrapped request//from w ww .j av a 2 s . c om * @throws ProtocolException when I am unable to build a new origin request. */ public HttpRequest buildConditionalRequest(HttpRequest request, HttpCacheEntry cacheEntry) throws ProtocolException { RequestWrapper wrapperRequest = new RequestWrapper(request); wrapperRequest.resetHeaders(); Header eTag = cacheEntry.getFirstHeader(HeaderConstants.ETAG); if (eTag != null) { wrapperRequest.setHeader(HeaderConstants.IF_NONE_MATCH, eTag.getValue()); } Header lastModified = cacheEntry.getFirstHeader(HeaderConstants.LAST_MODIFIED); if (lastModified != null) { wrapperRequest.setHeader(HeaderConstants.IF_MODIFIED_SINCE, lastModified.getValue()); } boolean mustRevalidate = false; for (Header h : cacheEntry.getHeaders(HeaderConstants.CACHE_CONTROL)) { for (HeaderElement elt : h.getElements()) { if (HeaderConstants.CACHE_CONTROL_MUST_REVALIDATE.equalsIgnoreCase(elt.getName()) || HeaderConstants.CACHE_CONTROL_PROXY_REVALIDATE.equalsIgnoreCase(elt.getName())) { mustRevalidate = true; break; } } } if (mustRevalidate) { wrapperRequest.addHeader("Cache-Control", "max-age=0"); } return wrapperRequest; }