![]() ![]() ![]() We first create a busy sending behavior (21~32 lines), so that the client side to build a full 5 connections then wait for 10s, that is, let the client idle after that, then build 5 groutines to send requests to the server side at the rate of one per second (not busy rhythm), let’s see the output of the server side after the program runs. Therefore a better solution would be to define an instance of the http client for a small range of applications.Ĭlient := & http. So how do we control the behavior of the client to avoid completing client-sending tasks in resource-constrained contexts? We do this by setting the relevant properties of http.DefaultClient, but DefaultClient is a package-level variable that is shared throughout the application, and once its properties are modified, other packages that use the http default client will also be affected. Defining http client instances for small-scale applications Since the sample runtime environment allows a maximum of 256 open file descriptors per process, a “socket: too many open files” error occurs when the client establishes a connection to the server at a later stage. It listens and responds to HTTP requests on its IP address with a particular port. HTTP server is basically a program running on a machine. However, due to the context of the server’s 10s delayed reply in the above example, the client does not wait for the reply to come back by default, but tries to establish a new connection to send a new http request. HTTP (Hypertext Transfer Protocol) is an application layer protocol and works in client-server mode. We know that by default, http clients maintain connections and reuse connections to services on the same host. Let’s use a diagram to describe the situation in the above example. The value of ulimit -n in the above demo environment is 256 We see that the client above throws a panic, prompting: too many open file descriptors. Users/tonybai/Go/src//bigwhite/experiments/http-client/default-client/client.go:14 +0x78 Users/tonybai/Go/src//bigwhite/experiments/http-client/default-client/client.go:18 +0x1c7 Panic: Get " dial tcp :8080: socket: too many open files
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