Joan Balagueró wrote:
Hello,
I’ve just migrated the code from HttpClient3 to HttpClient4, and before
starting tests I’d like to make you some questions:
1. When I set the Schema “new Scheme("http",
PlainSocketFactory.getSocketFactory(), 80)”, what does it mean? It
means that the “ThreadSafeClientConnManager” can only send http
requests, or it can only send http requests to destination port 80?
This value represents a default port for a particular scheme. If a
request URI does not explicitly specify a port the default port value
will be used when connecting to the target host
'http://www.whatever.com/' -> connect to www.whatever.com:80
2. With HttpClient3, I set the ‘retryHandler’ at method level with:
objPost.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,
new HttpRetryHandler(3));
With HttpClient4, this is similar but at connection level:
this.objHttp.setHttpRequestRetryHandler(new
DefaultHttpRequestRetryHandler(3, false));
Is it right?
This is correct.
For every get/post HttpClient will retry the request 3
times for any non-fatal error? Or should I set the retry handler at
method level like I used to do with HttpClient3? (I’ve not seen a method
to do this).
3. With HttpClient3, I used ‘HttpState’ for managing cookies.
With HttpClient4, I set a cookieStore to a HttpContext in this way:
HttpContext localContext = new BasicHttpContext();
CookieStore cookieStore = new BasicCookieStore();
// Set cookies.
for (int j = 0; j < cookieSize; j++)
{
BasicClientCookie bcc = new
BasicClientCookie(this.arrCookies[j].getName(),
this.arrCookies[j].getValue());
cookieStore.addCookie(bcc);
}
localContext.setAttribute(ClientContext.COOKIE_STORE, cookieStore);
this.objHttp.execute(objGet, localContext)
And, when I receive the server response, I get cookies using the same
HttpContext:
List<Cookie> auxCookies =
((CookieStore)localContext.getAttribute(ClientContext.COOKIE_STORE)).getCookies();
Is this the right way to do this?
Yes, it is
4. In HttpClient3, the documentation says that a small performance
can be gained by disabling cookies. The same for HttpClient4? If I
want to disable cookies, what I should to do? I saw this piece of
code on Internet, but I’m not sure if it’s right:
this.objHttp.setCookieStore(null);
this.objHttp.setCookieSpecs(null);
To completely disable cookie processing remove these two protocol
interceptors from the protocol processing chain
---
DefaultHttpClient httpclient = new DefaultHttpClient();
httpclient.removeRequestInterceptorByClass(RequestAddCookies.class);
httpclient.removeResponseInterceptorByClass(ResponseProcessCookies.class);
---
5. Receive a null HttpEntity means that the server sent an empty
response?
No, that usually can only happen if an HTTP response may not enclose a
response body at all: it is a response to a HEAD request, or a response
with status code 204, 205, 304.
Hope this helps
Oleg
Thanks for your time.
*JOAN BALAGUERÓ *
*GRUPO VENTUS*
C/ Balmes 195, 4º 4ª // 08006 BCN
Telf.: 902 43 05 75 // Fax: 93 292 01 49
www.grupoventus.com <http://www.grupoventus.com>
__
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
