// a null target may be acceptable, this depends on the route planner
// a null context is acceptable, default context created below
HttpContext execContext = null;
RequestDirector director = null;
HttpRoutePlanner routePlanner = null;
ConnectionBackoffStrategy connectionBackoffStrategy = null;
BackoffManager backoffManager = null;
// Initialize the request execution context making copies of
// all shared objects that are potentially threading unsafe.
synchronized (this) {
final HttpContext defaultContext = createHttpContext();
if (context == null) {
execContext = defaultContext;
} else {
execContext = new DefaultedHttpContext(context, defaultContext);
}
final HttpParams params = determineParams(request);
final RequestConfig config = HttpClientParamConfig.getRequestConfig(params);
execContext.setAttribute(ClientContext.REQUEST_CONFIG, config);
// Create a director for this request
director = createClientRequestDirector(
getRequestExecutor(),
getConnectionManager(),
getConnectionReuseStrategy(),
getConnectionKeepAliveStrategy(),
getRoutePlanner(),
getProtocolProcessor(),
getHttpRequestRetryHandler(),
getRedirectStrategy(),
getTargetAuthenticationStrategy(),
getProxyAuthenticationStrategy(),
getUserTokenHandler(),
params);
routePlanner = getRoutePlanner();
connectionBackoffStrategy = getConnectionBackoffStrategy();
backoffManager = getBackoffManager();
}
try {
if (connectionBackoffStrategy != null && backoffManager != null) {
final HttpHost targetForRoute = (target != null) ? target
: (HttpHost) determineParams(request).getParameter(
ClientPNames.DEFAULT_HOST);
final HttpRoute route = routePlanner.determineRoute(targetForRoute, request, execContext);
final CloseableHttpResponse out;
try {
out = CloseableHttpResponseProxy.newProxy(
director.execute(target, request, execContext));