AWS SDK for Go V2 - Add user agent to the AWS client

Question

Hi,
As part of Migrating to the AWS SDK for Go V2, I was trying to find a replacement for the next lines of code:

```
sess, err := session.NewSession(cfg)
sess.Handlers.Build.PushFrontNamed(addUserAgent)

// addUserAgent is a named handler that will add information to requests made by the AWS SDK.
var addUserAgent = request.NamedHandler{
	Name: "UserAgentHandler",
	Fn:   request.MakeAddToUserAgentHandler("Name", info.Version),
}

```
In V2 we use **config** instead of **session**, how can I register the user agent in V2?
I checked the documentation but couldn't find an answer.

Thank you,
Ori

Answer

Hello Ori,

User-Agent values can be set using the following methods:

AddUserAgentKey
AddUserAgentKeyValue
For example to add a key/value to the user-agent to a specific service client:

cfg, err := config.LoadDefaultConfig(context.Background())
if err != nil {
    panic(err)
}

sfnClient := sfn.NewFromConfig(cfg, func(options *sfn.Options) {
    options.APIOptions = append(options.APIOptions, middleware.AddUserAgentKeyValue("customKey", "customValue"))
})

APIOptions can also be mutated per-operation if wanting to add a specific User-Agent key per-operation, or can also be specified when calling config.LoadDefaultConfig if the user wants to apply the User-Agent to all clients created from the resulting aws.Config type.

AWS SDK for Go V2 - Add user agent to the AWS client

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