2/19/2023 0 Comments Http client golangTherefore 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. 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. 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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