- Golang default http client install#
- Golang default http client Patch#
- Golang default http client code#
# Modify to tweak parsing settings on the client-side only. If a host is not set, the proxy will not be used. # host/port must be either passed explicitly or set here. When using ClientTransport.httpsProxy() with or without credentials, # undefined, it will use whatever the default on the system is. # Socket options to set for the listening socket. # doesn't have to be fiddled with in most applications. # Can be used for fine-tuning request rendering performance but probably # The initial size of the buffer to render the request headers in. # Set to `infinite` to completely disable idle timeouts. # The time after which an idle connection will be automatically closed. # The time period within which the TCP connecting process must be completed. # the request, no `Server` header will be rendered at all. # If this value is the empty string and no header was included in # explicit `Server`-header was included in a response. There are some cases where you might want to use a different DNS resolver. Rather than closing a socket connection after an HTTP request, it will add it to an idle connection pool, and if you try to make another HTTP request before the idle connection timeout (90 seconds by default), then it will re-use that existing connection rather than creating a new one. The default HTTP client in Go uses the default DNS resolver available on the machine. # The default value of the `Server` header to produce if no Note that a Client will follow redirects by default. By default, the Golang HTTP client will do connection pooling. # Akka HTTP version, checked against the runtime version of Akka HTTP.
Golang default http client code#
It can directly replace the Transport of http.Client in existing projects, and obtain more powerful functions with minimal code change. # This is the reference config file that contains all the default settings. Compared with http.Transport, it also supports HTTP3, dump content, middleware, etc. These are the relevant default configuration values for the Akka HTTP modules. Usually this means that you provide an nf which contains all the application-specific settings that differ from the default ones provided by the reference configuration files from the individual Akka modules. This connection churn creates other issues, in our case it exhausted ports on the NAT, leading to SYN drops, and eventually an outage of the service ( gitlab-com/gl-infra/production#1999 (closed)).Just like any other Akka module, Akka HTTP is configured via Typesafe Config. We can make it user-tweakable in the future, but this should be high enough for quite a while.
Golang default http client Patch#
This patch increases the parameter to 100.
The default value for MaxIdleConnsPerHost is 2.
In other words: If we have more than MaxIdleConnsPerHost concurrent requests, we will constantly be opening and closing connections. Instead it will be closed after the request is done. 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. If the number of concurrent requests exceeds it, all of those "extra" requests will get their own connection established on demand ("burst capacity"), but that connection will not go back into the pool, hence not be reused. Concurrent requests up to MaxIdleConnsPerHost will get connections that are pooled and reused. MaxIdleConnsPerHost defines defines the threshold for burst capacity. Additional parameters: WithMaxRetries will determine how many retries should be attempted. Heimdall is an HTTP client that helps your application make a large number of requests, at scale. When you use http.Get (url), you are using the http.DefaultClient, a package variable that defines the default configuration for a client. If no log.Logger instance was given, the log will be disabled.
Golang default http client install#
The one we are concerned with in this case is MaxIdleConnsPerHost. Install go get /diegohordi/hardy Creating the client In order to create the Hardy client you will need to provide a http.Client and a log.Logger instances. Features Compatible with golang http stdlib: http.Request, http.Response and http. This transport has a few parameters that control its behaviour. Because golang HTTP client is a pain in the a. The hypothesis for why this happens is that we have lots of concurrent requests going through the transport. If we look at production, gitlab-pages is opening tens of connections to gitlab-api per second. While investigating gitlab-com/gl-infra/production#1999 (closed), we found out that golang's http.Client actually has an internal connection pooler called http.Transport.
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