Avoid StringBuilder.AppendFormat

[paulomorgado]

Describe the feature

Amazon.Runtime.Internal.Marshaller.SetUserAgentHeader has this code:

private static void SetUserAgentHeader(IRequestContext requestContext)
{
    var sb = new StringBuilder(requestContext.ClientConfig.UserAgent);

    var clientAppId = requestContext.ClientConfig.ClientAppId;
    if (!string.IsNullOrEmpty(clientAppId))
        sb.AppendFormat(" app/{0}", clientAppId);

    var retryMode = requestContext.ClientConfig.RetryMode.ToString().ToLower();
    sb.AppendFormat(" cfg/retry-mode#{0}", retryMode);

    sb.AppendFormat(" md/{0}", requestContext.IsAsync ? "ClientAsync" : "ClientSync");

    sb.AppendFormat(" cfg/init-coll#{0}", AWSConfigs.InitializeCollections ? "1" : "0");

    var userAgentAddition = requestContext.OriginalRequest.UserAgentAddition;
    if (!string.IsNullOrEmpty(userAgentAddition))
    {
        sb.AppendFormat(" {0}", userAgentAddition);
    }

    var userAgent = sb.ToString();

    userAgent = InternalSDKUtils.ReplaceInvalidUserAgentCharacters(userAgent);

    if (requestContext.ClientConfig.UseAlternateUserAgentHeader)
    {
        requestContext.Request.Headers[HeaderKeys.XAmzUserAgentHeader] = userAgent;
    }
    else
    {
        requestContext.Request.Headers[HeaderKeys.UserAgentHeader] = userAgent;
    }
}

There's no practical use of `StringBuilder.AppendFormat here.

Use Case

Creating objects that do not need to be created, not only uses memory and CPU to create them, but also causes GC work.

Interpreting a format and formatting is unnecessary work when appending to a StringBuilder.

Proposed Solution

Consider using:

private static void SetUserAgentHeader(IRequestContext requestContext)
{
    var sb = new StringBuilder(requestContext.ClientConfig.UserAgent);

    var clientAppId = requestContext.ClientConfig.ClientAppId;
    if (!string.IsNullOrEmpty(clientAppId))
        sb.Append(" app/").Append(clientAppId);

    sb.Append(" cfg/retry-mode#}");
    foreach (var c in requestContext.ClientConfig.RetryMode.ToString())
        sb.Append(char.ToLowerInvariant(c));

    sb.Append(" md/").Append(requestContext.IsAsync ? "ClientAsync" : "ClientSync");

    sb.Append(" cfg/init-coll#").Append(AWSConfigs.InitializeCollections ? "1" : "0");

    var userAgentAddition = requestContext.OriginalRequest.UserAgentAddition;
    if (!string.IsNullOrEmpty(userAgentAddition))
    {
        sb.Append(' ').Append(userAgentAddition);
    }

    var userAgent = sb.ToString();

    userAgent = InternalSDKUtils.ReplaceInvalidUserAgentCharacters(userAgent);

    if (requestContext.ClientConfig.UseAlternateUserAgentHeader)
    {
        requestContext.Request.Headers[HeaderKeys.XAmzUserAgentHeader] = userAgent;
    }
    else
    {
        requestContext.Request.Headers[HeaderKeys.UserAgentHeader] = userAgent;
    }
}

Other Information

But, how much can change in the user-agent string that needs to be computed for every request?

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

AWS .NET SDK and/or Package version used

AWSSDK.KeyManagementService 3.7.300.52

Targeted .NET Platform

.NET 8

Operating System and version

Windows and Linux

[bhoradc]

Hi @paulomorgado,

Thanks for submitting the feature request. I will further review the optimization technique you proposed with the .NET SDK team.

Regards,
Chaitanya

[peterrsongg]

@paulomorgado Thanks for the proposed solution. would you mind adding a benchmark that shows the before and after of making this change? Would be good to see if this is something we want to do.

[paulomorgado]

@peterrsongg, here is a benchmark:

Invoking InternalSDKUtils.ReplaceInvalidUserAgentCharacters individually only on strings that might need it, will also cut some time and memory usage.

Using a StringBuilder pool also cuts a lot of time and memory usage. But that should, probably let the user be in control of it, like how Newtonsoft.Json allows for a byte[] pool.

[MemoryDiagnoser]
public class StringBuilderBenchmarks
{
    private static readonly ObjectPool<StringBuilder> stringBuilderPool = (new DefaultObjectPoolProvider()).CreateStringBuilderPool(initialCapacity: 256, maximumRetainedCapacity: 1024);

    [Params("aws-sdk-dotnet-coreclr/3.7.300.52 ua/2.0 os/windows#10.0.19045.0 md/ARCH#X64 lang/.NET_Core#8.0.7 md/aws-sdk-dotnet-core#3.7.302.12 api/KMS#3.7.300.52")]
    public string UserAgent { get; set; } = null!;

    [Params(null, "UserAgentAddition", "{[(UserAgentAddition)]}")]
    public string? UserAgentAddition { get; set; }

    [Params(null, "ClientAppId")]
    public string? ClientAppId { get; set; }

    [Params(RequestRetryMode.Standard, RequestRetryMode.Adaptive)]
    public RequestRetryMode RetryMode { get; set; }

    [Params(false, true)]
    public bool IsAsync { get; set; }

    [Params(false, true)]
    public bool InitializeCollections { get; set; }

    [Benchmark(Baseline = true)]
    public string Existing_SetUserAgentHeader()
    {
        var sb = new StringBuilder(UserAgent);

        var clientAppId = ClientAppId;
        if (!string.IsNullOrEmpty(clientAppId))
            sb.AppendFormat(" app/{0}", clientAppId);

        var retryMode = RetryMode.ToString().ToLower();
        sb.AppendFormat(" cfg/retry-mode#{0}", retryMode);

        sb.AppendFormat(" md/{0}", IsAsync ? "ClientAsync" : "ClientSync");

        sb.AppendFormat(" cfg/init-coll#{0}", InitializeCollections ? "1" : "0");

        var userAgentAddition = UserAgentAddition;
        if (!string.IsNullOrEmpty(userAgentAddition))
        {
            sb.AppendFormat(" {0}", userAgentAddition);
        }

        var userAgent = sb.ToString();

        userAgent = InternalSDKUtils.ReplaceInvalidUserAgentCharacters(userAgent);

        return userAgent;
    }

    [Benchmark]
    public string NoAppendFormat_SetUserAgentHeader()
    {
        var sb = new StringBuilder(256);

        return Optimized(sb);
    }

    [Benchmark]
    public string NoAppendFormat_PooledStringBuilder_SetUserAgentHeader()
        {
            var sb = stringBuilderPool.Get();

            try
            {
                return Optimized(sb);
            }
            finally
            {
                stringBuilderPool.Return(sb);
            }
        }

    private string Optimized(StringBuilder sb)
    {
        sb.Append(InternalSDKUtils.ReplaceInvalidUserAgentCharacters(UserAgent));
        //sb.Append(UserAgent);

        var clientAppId = ClientAppId;
        if (!string.IsNullOrEmpty(clientAppId))
        {
            sb.Append(" app/").Append(InternalSDKUtils.ReplaceInvalidUserAgentCharacters(clientAppId));
            //sb.Append(" app/").Append(clientAppId);
        }

        sb.Append(" cfg/retry-mode#}");
        sb.Append(RetryMode.ToUserAgentHeaderString());

        sb.Append(" md/").Append(IsAsync ? "ClientAsync" : "ClientSync");

        sb.Append(" cfg/init-coll#").Append(InitializeCollections ? '1' : '0');

        var userAgentAddition = UserAgentAddition;
        if (!string.IsNullOrEmpty(userAgentAddition))
        {
            sb.Append(' ').Append(InternalSDKUtils.ReplaceInvalidUserAgentCharacters(userAgentAddition));
            //sb.Append(' ').Append(userAgentAddition);
        }

        var userAgent = sb.ToString();

        //userAgent = InternalSDKUtils.ReplaceInvalidUserAgentCharacters(userAgent);

        return userAgent;
    }
}

internal static partial class InternalSDKUtils
{
    private const string DisallowedCharactersRegexPattern = @"[^ /!#$%&'*+-.^_`|~\w\d]";

    [GeneratedRegex(DisallowedCharactersRegexPattern)]
    private static partial Regex DisallowedCharactersRegex();

    internal static string ReplaceInvalidUserAgentCharacters(string userAgent)
    {
        // Use the regular expression to replace disallowed characters by a hyphen
        var validUserAgent = DisallowedCharactersRegex().Replace(userAgent, "-");
        //var validUserAgent = userAgent;

        return validUserAgent;
    }

    public static string ToUserAgentHeaderString(this RequestRetryMode requestRetryMode)
    {
        if (requestRetryMode == RequestRetryMode.Adaptive)
            return "adaptive";
        else
            return "standard";
    }
}

public enum RequestRetryMode
{
    Standard,
    Adaptive
}

BenchmarkDotNet v0.13.12, Windows 11 (10.0.26100.1301)
13th Gen Intel Core i9-13900K, 1 CPU, 32 logical and 24 physical cores
.NET SDK 9.0.100-preview.6.24328.19
  [Host]     : .NET 8.0.7 (8.0.724.31311), X64 RyuJIT AVX2
  DefaultJob : .NET 8.0.7 (8.0.724.31311), X64 RyuJIT AVX2

Method	UserAgent	UserAgentAddition	ClientAppId	RetryMode	IsAsync	InitializeCollections	Mean	Error	StdDev	Median	P50	P90	P95	Ratio	RatioSD	Gen0	Gen1	Allocated	Alloc Ratio
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Standard	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	1.00	0.00	0.0663	-	1248 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Standard	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.54	0.02	0.0539	0.0001	1016 B	0.81
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Standard	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.42	0.01	0.0229	-	432 B	0.35
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Standard	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	1.00	0.00	0.0663	-	1248 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Standard	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.58	0.01	0.0539	0.0001	1016 B	0.81
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Standard	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.46	0.01	0.0229	-	432 B	0.35
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Standard	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	1.00	0.00	0.0663	-	1248 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Standard	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.57	0.01	0.0544	0.0001	1024 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Standard	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.45	0.00	0.0234	-	440 B	0.35
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Standard	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	1.00	0.00	0.0663	-	1248 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Standard	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.56	0.01	0.0544	0.0001	1024 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Standard	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.45	0.01	0.0234	-	440 B	0.35
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Adaptive	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	1.00	0.00	0.0663	-	1248 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Adaptive	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.58	0.01	0.0539	0.0001	1016 B	0.81
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Adaptive	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.46	0.01	0.0229	-	432 B	0.35
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Adaptive	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	1.00	0.00	0.0663	-	1248 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Adaptive	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.59	0.02	0.0539	0.0001	1016 B	0.81
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Adaptive	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.46	0.01	0.0229	-	432 B	0.35
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Adaptive	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	1.00	0.00	0.0663	-	1248 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Adaptive	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.59	0.02	0.0544	0.0001	1024 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Adaptive	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.47	0.01	0.0234	-	440 B	0.35
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Adaptive	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	1.00	0.00	0.0663	-	1248 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Adaptive	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.56	0.03	0.0544	0.0001	1024 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	?	?	Adaptive	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.44	0.02	0.0234	-	440 B	0.35
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Standard	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0002 ms	0.0002 ms	1.00	0.00	0.0679	-	1280 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Standard	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.66	0.02	0.0557	0.0001	1048 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Standard	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.56	0.02	0.0246	-	464 B	0.36
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Standard	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	1.00	0.00	0.0679	-	1280 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Standard	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.72	0.02	0.0557	0.0001	1048 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Standard	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.59	0.01	0.0246	-	464 B	0.36
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Standard	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	1.00	0.00	0.0679	-	1280 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Standard	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.72	0.01	0.0560	0.0001	1056 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Standard	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.63	0.02	0.0250	-	472 B	0.37
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Standard	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	1.00	0.00	0.0679	-	1280 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Standard	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.79	0.03	0.0560	0.0001	1056 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Standard	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.59	0.01	0.0250	-	472 B	0.37
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Adaptive	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0002 ms	1.00	0.00	0.0679	-	1280 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Adaptive	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.68	0.02	0.0557	0.0001	1048 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Adaptive	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.57	0.02	0.0246	-	464 B	0.36
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Adaptive	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	1.00	0.00	0.0679	-	1280 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Adaptive	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.68	0.02	0.0557	0.0001	1048 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Adaptive	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.60	0.02	0.0246	-	464 B	0.36
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Adaptive	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	1.00	0.00	0.0679	-	1280 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Adaptive	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.71	0.01	0.0560	0.0001	1056 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Adaptive	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.60	0.01	0.0250	-	472 B	0.37
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Adaptive	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	1.00	0.00	0.0679	-	1280 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Adaptive	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.68	0.02	0.0560	0.0001	1056 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	?	ClientAppId	Adaptive	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.57	0.02	0.0250	-	472 B	0.37
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Standard	False	False	0.0003 ms	0.0000 ms	0.0000 ms	0.0003 ms	0.0003 ms	0.0003 ms	0.0003 ms	1.00	0.00	0.0939	-	1776 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Standard	False	False	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.81	0.02	0.0603	-	1136 B	0.64
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Standard	False	False	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.73	0.02	0.0293	-	552 B	0.31
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Standard	False	True	0.0003 ms	0.0000 ms	0.0000 ms	0.0003 ms	0.0003 ms	0.0003 ms	0.0003 ms	1.00	0.00	0.0939	-	1776 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Standard	False	True	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.80	0.03	0.0603	-	1136 B	0.64
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Standard	False	True	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.74	0.02	0.0293	-	552 B	0.31
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Standard	True	False	0.0003 ms	0.0000 ms	0.0000 ms	0.0003 ms	0.0003 ms	0.0003 ms	0.0003 ms	1.00	0.00	0.0939	-	1776 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Standard	True	False	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.80	0.02	0.0606	-	1144 B	0.64
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Standard	True	False	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.74	0.02	0.0296	-	560 B	0.32
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Standard	True	True	0.0003 ms	0.0000 ms	0.0000 ms	0.0003 ms	0.0003 ms	0.0003 ms	0.0003 ms	1.00	0.00	0.0939	-	1776 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Standard	True	True	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.82	0.01	0.0606	-	1144 B	0.64
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Standard	True	True	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.75	0.01	0.0296	-	560 B	0.32
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Adaptive	False	False	0.0003 ms	0.0000 ms	0.0000 ms	0.0003 ms	0.0003 ms	0.0003 ms	0.0003 ms	1.00	0.00	0.0939	-	1776 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Adaptive	False	False	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.81	0.02	0.0603	-	1136 B	0.64
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Adaptive	False	False	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.74	0.01	0.0293	-	552 B	0.31
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Adaptive	False	True	0.0003 ms	0.0000 ms	0.0000 ms	0.0003 ms	0.0003 ms	0.0003 ms	0.0003 ms	1.00	0.00	0.0939	-	1776 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Adaptive	False	True	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.81	0.03	0.0603	-	1136 B	0.64
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Adaptive	False	True	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.74	0.01	0.0293	-	552 B	0.31
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Adaptive	True	False	0.0003 ms	0.0000 ms	0.0000 ms	0.0003 ms	0.0003 ms	0.0003 ms	0.0003 ms	1.00	0.00	0.0939	-	1776 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Adaptive	True	False	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.80	0.01	0.0606	-	1144 B	0.64
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Adaptive	True	False	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.73	0.01	0.0296	-	560 B	0.32
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Adaptive	True	True	0.0003 ms	0.0000 ms	0.0000 ms	0.0003 ms	0.0003 ms	0.0003 ms	0.0003 ms	1.00	0.00	0.0939	-	1776 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Adaptive	True	True	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.79	0.04	0.0606	-	1144 B	0.64
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	?	Adaptive	True	True	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.72	0.02	0.0296	-	560 B	0.32
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Standard	False	False	0.0003 ms	0.0000 ms	0.0000 ms	0.0003 ms	0.0003 ms	0.0003 ms	0.0003 ms	1.00	0.00	0.0978	-	1840 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Standard	False	False	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.82	0.01	0.0620	-	1168 B	0.63
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Standard	False	False	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.79	0.01	0.0310	-	584 B	0.32
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Standard	False	True	0.0003 ms	0.0000 ms	0.0000 ms	0.0003 ms	0.0003 ms	0.0003 ms	0.0003 ms	1.00	0.00	0.0978	-	1840 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Standard	False	True	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0003 ms	0.0003 ms	0.84	0.03	0.0620	-	1168 B	0.63
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Standard	False	True	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.77	0.02	0.0310	-	584 B	0.32
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Standard	True	False	0.0003 ms	0.0000 ms	0.0000 ms	0.0003 ms	0.0003 ms	0.0003 ms	0.0003 ms	1.00	0.00	0.0978	-	1840 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Standard	True	False	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.79	0.02	0.0625	-	1176 B	0.64
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Standard	True	False	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.74	0.02	0.0312	-	592 B	0.32
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Standard	True	True	0.0003 ms	0.0000 ms	0.0000 ms	0.0003 ms	0.0003 ms	0.0003 ms	0.0003 ms	1.00	0.00	0.0978	-	1840 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Standard	True	True	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.78	0.03	0.0625	-	1176 B	0.64
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Standard	True	True	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.73	0.03	0.0312	-	592 B	0.32
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Adaptive	False	False	0.0003 ms	0.0000 ms	0.0000 ms	0.0003 ms	0.0003 ms	0.0003 ms	0.0003 ms	1.00	0.00	0.0978	-	1840 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Adaptive	False	False	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0003 ms	0.82	0.03	0.0620	-	1168 B	0.63
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Adaptive	False	False	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.76	0.02	0.0310	-	584 B	0.32
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Adaptive	False	True	0.0003 ms	0.0000 ms	0.0000 ms	0.0003 ms	0.0003 ms	0.0003 ms	0.0003 ms	1.00	0.00	0.0978	-	1840 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Adaptive	False	True	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.80	0.02	0.0620	-	1168 B	0.63
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Adaptive	False	True	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.77	0.02	0.0310	-	584 B	0.32
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Adaptive	True	False	0.0003 ms	0.0000 ms	0.0000 ms	0.0003 ms	0.0003 ms	0.0003 ms	0.0003 ms	1.00	0.00	0.0978	-	1840 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Adaptive	True	False	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.76	0.03	0.0625	-	1176 B	0.64
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Adaptive	True	False	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.72	0.02	0.0312	-	592 B	0.32
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Adaptive	True	True	0.0003 ms	0.0000 ms	0.0000 ms	0.0003 ms	0.0003 ms	0.0003 ms	0.0003 ms	1.00	0.00	0.0978	-	1840 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Adaptive	True	True	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.82	0.01	0.0625	-	1176 B	0.64
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	{[(Us(...)on)]} [23]	ClientAppId	Adaptive	True	True	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.75	0.01	0.0312	-	592 B	0.32
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Standard	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	1.00	0.00	0.0684	-	1288 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Standard	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.68	0.02	0.0560	0.0001	1056 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Standard	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.59	0.02	0.0250	-	472 B	0.37
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Standard	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	1.00	0.00	0.0684	-	1288 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Standard	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.68	0.02	0.0560	0.0001	1056 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Standard	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.59	0.01	0.0250	-	472 B	0.37
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Standard	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0002 ms	0.0002 ms	1.00	0.00	0.0684	-	1288 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Standard	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.68	0.02	0.0560	0.0001	1056 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Standard	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.58	0.02	0.0250	-	472 B	0.37
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Standard	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	1.00	0.00	0.0684	-	1288 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Standard	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.70	0.01	0.0560	0.0001	1056 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Standard	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.61	0.02	0.0250	-	472 B	0.37
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Adaptive	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0002 ms	0.0002 ms	1.00	0.00	0.0684	-	1288 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Adaptive	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.69	0.02	0.0560	0.0001	1056 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Adaptive	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.58	0.02	0.0250	-	472 B	0.37
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Adaptive	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	1.00	0.00	0.0684	-	1288 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Adaptive	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.72	0.02	0.0560	0.0001	1056 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Adaptive	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.60	0.01	0.0250	-	472 B	0.37
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Adaptive	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	1.00	0.00	0.0684	-	1288 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Adaptive	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.69	0.02	0.0560	0.0001	1056 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Adaptive	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.58	0.02	0.0250	-	472 B	0.37
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Adaptive	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	1.00	0.00	0.0684	-	1288 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Adaptive	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.70	0.01	0.0560	0.0001	1056 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	?	Adaptive	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.60	0.02	0.0250	-	472 B	0.37
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Standard	False	False	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	1.00	0.00	0.0701	-	1320 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Standard	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.78	0.01	0.0577	-	1088 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Standard	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.70	0.01	0.0267	-	504 B	0.38
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Standard	False	True	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	1.00	0.00	0.0701	-	1320 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Standard	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.81	0.02	0.0577	-	1088 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Standard	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.71	0.02	0.0267	-	504 B	0.38
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Standard	True	False	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	1.00	0.00	0.0701	-	1320 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Standard	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.80	0.02	0.0577	-	1088 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Standard	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.70	0.01	0.0267	-	504 B	0.38
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Standard	True	True	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	1.00	0.00	0.0701	-	1320 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Standard	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.80	0.02	0.0577	-	1088 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Standard	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.72	0.01	0.0267	-	504 B	0.38
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Adaptive	False	False	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	1.00	0.00	0.0701	-	1320 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Adaptive	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.79	0.02	0.0577	-	1088 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Adaptive	False	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.70	0.02	0.0267	-	504 B	0.38
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Adaptive	False	True	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	1.00	0.00	0.0701	-	1320 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Adaptive	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.82	0.01	0.0577	-	1088 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Adaptive	False	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.74	0.02	0.0267	-	504 B	0.38
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Adaptive	True	False	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	1.00	0.00	0.0701	-	1320 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Adaptive	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.78	0.02	0.0577	-	1088 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Adaptive	True	False	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.68	0.02	0.0267	-	504 B	0.38
Existing_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Adaptive	True	True	0.0002 ms	0.0000 ms	0.0000 ms	0.0002 ms	0.0002 ms	0.0002 ms	0.0002 ms	1.00	0.00	0.0701	-	1320 B	1.00
NoAppendFormat_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Adaptive	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.79	0.02	0.0577	-	1088 B	0.82
NoAppendFormat_PooledStringBuilder_SetUserAgentHeader	aws-(...)0.52 [150]	UserAgentAddition	ClientAppId	Adaptive	True	True	0.0001 ms	0.0000 ms	0.0000 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.0001 ms	0.70	0.02	0.0267	-	504 B	0.38

[dscpinheiro]

Your PR has been merged and will be included in the next preview release of the SDK.

Thanks again for the contribution!