Client/Server Request Compression

In addition to optimized cached Server Responses you can also elect to compress HTTP Requests in any C#/.NET Service Clients by specifying the Compression Type you wish to use, e.g:

var client = new JsonServiceClient(baseUrl) {
    RequestCompressionType = CompressionTypes.GZip,

var client = new JsonHttpClient(baseUrl) {
    RequestCompressionType = CompressionTypes.Deflate,

var response = client.Post(new Request { ... });

Where sending any HTTP Request containing a Request Body (e.g. POST/PUT) will send a compressed Request body to the Server where it's now able to be transparently decompressed and deserialized into your Request DTO.

[CompressResponse] Attribute

You can now selectively choose which Services should be compressed with the new [CompressResponse] attribute to compress responses for clients which support compression, which can be applied to most Response Types, e.g:

public class CompressedServices : Service
    public object Any(CompressDto request) => new CompressExamplesResponse(); 
    public object Any(CompressString request) => "foo"; 
    public object Any(CompressBytes request) => "foo".ToUtf8Bytes(); 
    public object Any(CompressStream request) => new MemoryStream("foo".ToUtf8Bytes()); 
    public object Any(CompressFile request) => new HttpResult(VirtualFileSources.GetFile("/foo"));

    public object Any(CompressAnyHttpResult request)
        return new HttpResult(new CompressExamplesResponse());    // DTO
        return new HttpResult("foo", "text/plain");               // string
        return new HttpResult("foo".ToUtf8Bytes(), "text/plain"); // bytes


using [CompressResponse] is unnecessary when returning cached responses as ServiceStack automatically caches and returns the most optimal Response - typically compressed bytes for clients that supports compression

Static File Compression

ServiceStack can also be configured to compress static files with specific file extensions that are larger than specific size with the new opt-in Config options below:

SetConfig(new HostConfig {
    CompressFilesWithExtensions = { "js", "css" },
    // (optional), only compress .js or .css files > 10k
    CompressFilesLargerThanBytes = 10 * 1024 

When more fine-grained logic is needed you can override ShouldCompressFile() in your AppHost to choose which static files you want to compress on a per-file basis, e.g:

public override bool ShouldCompressFile(IVirtualFile file)
    return base.ShouldCompressFile(file) || file.Name == "large.csv";

When to enable Static File Compression

It's more optimal to configure static file compression on the native Web Server that's hosting your ServiceStack App than in managed code. You can use Fiddler to check if your Web Server (e.g. IIS) is already compressing static files in which case you won't want to configure ServiceStack to do it.

No compression is added when running ServiceStack in a self-host, which will benefit from enabling Static File Compression.