// set up connection defaults, and details from request
private static HttpURLConnection createConnection(Connection.Request req) throws IOException {
HttpURLConnection conn = (HttpURLConnection) req.url().openConnection();
conn.setRequestMethod(req.method().name());
conn.setInstanceFollowRedirects(false); // don't rely on native redirection support
conn.setConnectTimeout(req.timeout());
conn.setReadTimeout(req.timeout());
if (req.method() == Method.POST) conn.setDoOutput(true);
if (req.cookies().size() > 0) conn.addRequestProperty("Cookie", getRequestCookieString(req));
for (Map.Entry<String, String> header : req.headers().entrySet()) {
conn.addRequestProperty(header.getKey(), header.getValue());
}
return conn;
}
public Connection method(Method method) {
req.method(method);
return this;
}
static Response execute(Connection.Request req, Response previousResponse) throws IOException {
Validate.notNull(req, "Request must not be null");
String protocol = req.url().getProtocol();
Validate.isTrue(
protocol.equals("http") || protocol.equals("https"),
"Only http & https protocols supported");
// set up the request for execution
if (req.method() == Connection.Method.GET && req.data().size() > 0)
serialiseRequestUrl(req); // appends query string
HttpURLConnection conn = createConnection(req);
conn.connect();
if (req.method() == Connection.Method.POST) writePost(req.data(), conn.getOutputStream());
int status = conn.getResponseCode();
boolean needsRedirect = false;
if (status != HttpURLConnection.HTTP_OK) {
if (status == HttpURLConnection.HTTP_MOVED_TEMP
|| status == HttpURLConnection.HTTP_MOVED_PERM
|| status == HttpURLConnection.HTTP_SEE_OTHER) needsRedirect = true;
else if (!req.ignoreHttpErrors())
throw new IOException(status + " error loading URL " + req.url().toString());
}
Response res = new Response(previousResponse);
res.setupFromConnection(conn, previousResponse);
if (needsRedirect && req.followRedirects()) {
req.method(
Method
.GET); // always redirect with a get. any data param from original req are dropped.
req.data().clear();
req.url(new URL(req.url(), res.header("Location")));
for (Map.Entry<String, String> cookie :
res.cookies.entrySet()) { // add response cookies to request (for e.g. login posts)
req.cookie(cookie.getKey(), cookie.getValue());
}
return execute(req, res);
}
res.req = req;
InputStream bodyStream = null;
InputStream dataStream = null;
try {
dataStream = conn.getErrorStream() != null ? conn.getErrorStream() : conn.getInputStream();
bodyStream =
res.hasHeader("Content-Encoding")
&& res.header("Content-Encoding").equalsIgnoreCase("gzip")
? new BufferedInputStream(new GZIPInputStream(dataStream))
: new BufferedInputStream(dataStream);
res.byteData = DataUtil.readToByteBuffer(bodyStream);
res.charset =
DataUtil.getCharsetFromContentType(
res.contentType); // may be null, readInputStream deals with it
} finally {
if (bodyStream != null) bodyStream.close();
if (dataStream != null) dataStream.close();
}
res.executed = true;
return res;
}
public Document post() throws IOException {
req.method(Method.POST);
execute();
return res.parse();
}