HttpClient(4.3.5) - HTTP Request & HTTP Response
HTTP Request
All HTTP requests have a request line consisting a method name, a request URI and an HTTP protocol version.
HttpClient supports out of the box all HTTP methods defined in the HTTP/1.1 specification: GET
, HEAD
, POST
, PUT
, DELETE
, TRACE
and OPTIONS
. There is a specific class for each method type.: HttpGet
, HttpHead
, HttpPost
, HttpPut
, HttpDelete
, HttpTrace
, and HttpOptions
.
The Request-URI is a Uniform Resource Identifier that identifies the resource upon which to apply the request. HTTP request URIs consist of a protocol scheme, host name, optional port, resource path, optional query, and optional fragment.
HttpGet httpget = new HttpGet(
"http://www.google.com/search?hl=en&q=httpclient&btnG=Google+Search&aq=f&oq=");
HttpClient provides URIBuilder
utility class to simplify creation and modification of request URIs.
URI uri = new URIBuilder()
.setScheme("http")
.setHost("www.google.com")
.setPath("/search")
.setParameter("q", "httpclient")
.setParameter("btnG", "Google Search")
.setParameter("aq", "f")
.setParameter("oq", "")
.build();
HttpGet httpget = new HttpGet(uri);
System.out.println(httpget.getURI());
stdout >
http://www.google.com/search?q=httpclient&btnG=Google+Search&aq=f&oq=
HTTP Response
HTTP response is a message sent by the server back to the client after having received and interpreted a request message. The first line of that message consists of the protocol version followed by a numeric status code and its associated textual phrase.
HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1,
HttpStatus.SC_OK, "OK"); System.out.println(response.getProtocolVersion());
System.out.println(response.getStatusLine().getStatusCode());
System.out.println(response.getStatusLine().getReasonPhrase());
System.out.println(response.getStatusLine().toString());
stdout >
HTTP/1.1
200
OK
HTTP/1.1 200 OK
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