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

巴特西

HttpClient(4.3.5) - HTTP Request & HTTP Response

HTTP Request

HTTP Response

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