HTTP Head of line blocking Head of Line blocking in HTTP terms is often referring to the fact that each browser/client has a limited number of connections to a server and doing a new request over one of those connections has to wait for the ones to complete before it can fire it off. The … Read more
Assume your socket is named s… you need to set socket.SO_REUSEADDR on the server’s socket before binding to an interface… this will allow you to immediately restart a TCP server… s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) s.bind((ADDR, PORT))
It is both. It is bidirectional because it can send data in both directions, and it is full-duplex because it can do that simultaneously, without requiring line turnarounds, at the API level. Of course at a lower level it may be restricted by the available physical layer.
I had a similar issue with Docker for Windows and Hyper-V having reserved ports for its own use- in my case, it was port 3001 that couldn’t be accessed. The port wasn’t be used by another process- running netstat -ano | findstr 3001 in an Administrator Powershell prompt showed nothing. However, netsh interface ipv4 show … Read more
A recent post by Jacques Mattheij, referencing your very question, claims that although HTTP was designed as a synchronous protocol, the implementation was not. In practise the browser (he doesn’t specify which exactly) accepts answers to requests have not been sent yet. On the other hand, if you are looking to something less hacky, you … Read more
Opening sockets in python is pretty simple. You really just need something like this: import socket sock = socket.socket() sock.connect((address, port)) and then you can send() and recv() like any other socket
Pulling the network cable will not break a TCP connection(1) though it will disrupt communications. You can plug the cable back in and once IP connectivity is established, all back-data will move. This is what makes TCP reliable, even on cellular networks. When TCP sends data, it expects an ACK in reply. If none comes … Read more
Does this mean that the send() call will always return immediately if there is room in the kernel send buffer? Yes. As long as immediately means after the memory you provided it has been copied to the kernel’s buffer. Which, in some edge cases, may not be so immediate. For instance if the pointer you … Read more
Postgres core developer Bruce Momjian has blogged about this topic. Momjian states, “Unix-domain socket communication is measurably faster.” He measured query network performance showing that the local domain socket was 33% faster than using the TCP/IP stack.
To answer to your second question. You can just hit the IP address of the machine that your flask app is running, e.g. 192.168.1.100 in a browser on different machine on the same network and you are there. Though, you will not be able to access it if you are on a different network. Firewalls … Read more