HttpsURLConnection and intermittent connections
I'm hoping someone could help me out with intermittent connections I'm getting using code with HttpsURLConnection. The code I'm using is below:
HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
conn.setReadTimeout(10 * 1000);
if conn.getResponseCode() != 200) {
开发者_运维百科 Log.v(TAG, "error code:" + conn.getResponseCode());
}
The connection works the first time everytime when I use it to pull a json file. However, when I use the connection again to send a command, it always fails the first time. It then typically works if I send the command quickly ( within 5 seconds), but fails if I wait a while. I don't think its a SSL issue because it connects the first time correctly, but I could be wrong here. I also tried many different variations such as adding:
conn.setUseCaches(false);
conn.setRequestProperty("Connection","Keep-Alive");
conn.getHostnameVerifier();
conn.getSSLSocketFactory();
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setRequestMethod("POST");
conn.wait(100);
However, I had no luck. Any help would be greatly appreciated.
Try System.setProperty("http.keepAlive", "false");
before you do
HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
Try this code - it works pretty reliably for me:
public static final String USER_AGENT = "Mozilla/5.0 (Linux; U; Android 1.1; en-us;dream) AppleWebKit/525.10+ (KHTML, like Gecko) Version/3.0.4 Mobile Safari/523.12.2";
private DefaultHttpClient getThreadSafeHttpClient() {
final HttpParams params = new BasicHttpParams();
params.setParameter("http.useragent", USER_AGENT);
HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
HttpProtocolParams.setContentCharset(params, "UTF-8");
final SchemeRegistry registry = new SchemeRegistry();
registry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));
final SSLSocketFactory sslSocketFactory = SSLSocketFactory.getSocketFactory();
sslSocketFactory.setHostnameVerifier(SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
registry.register(new Scheme("https", sslSocketFactory, 443));
final ThreadSafeClientConnManager manager = new ThreadSafeClientConnManager(params, registry);
final DefaultHttpClient httpclient = new DefaultHttpClient(manager, params);
// how to handle retries
final HttpRequestRetryHandler myRetryHandler = new HttpRequestRetryHandler() {
public boolean retryRequest(final IOException exception, final int executionCount, final HttpContext context) {
if (executionCount >= 5) {
// Do not retry if over max retry count
return false;
}
if (exception instanceof NoHttpResponseException) {
// Retry if the server dropped connection on us
return true;
}
if (exception instanceof SSLHandshakeException) {
// Do not retry on SSL handshake exception
return false;
}
final HttpRequest request = (HttpRequest) context.getAttribute(ExecutionContext.HTTP_REQUEST);
final boolean idempotent = !(request instanceof HttpEntityEnclosingRequest);
if (idempotent) {
// Retry if the request is considered idempotent
return true;
}
return false;
}
};
httpclient.setHttpRequestRetryHandler(myRetryHandler);
return httpclient;
}
Just a little addition to m6tt's answer above:
private static void disableConnectionReuseIfNecessary() {
// HTTP connection reuse which was buggy pre-froyo
if (!Constants.SUPPORTS_FROYO) {
System.setProperty("http.keepAlive", "false");
}
}
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