client-server

Sending POST data in Android

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Note (Oct 2020): AsyncTask used in the following answer has been deprecated in Android API level 30. Please refer to Official documentation or this blog post for a more updated example Updated (June 2017) Answer which works on Android 6.0+. Thanks to @Rohit Suthar, @Tamis Bolvari and @sudhiskr for the comments. References: https://developer.android.com/reference/java/net/HttpURLConnection.html How to … Read more

Does TCP send a SYN/ACK on every packet or only on the first connection?

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It’s kinda like: SYN starts a connection; you’ll usually only see it when the connection’s being established. But all data being sent via TCP requires an ACK. Every byte sent must be accounted for, or it will be retransmitted (or the connection reset (closed), in severe cases). Actual connections aren’t usually exactly like the diagram above, though, … Read more