Modular HTTP server framework for Go
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Falcore has Moved

Fitstar Falcore »

The Fitstar fork has tons of updates that break backwards compatibility so we are leaving this repo live for reference of the older interfaces. It will no longer be maintained here, though so you should upgrade to the Fitstar fork.


Falcore is a framework for constructing high performance, modular HTTP servers in Golang.

Read more on our blog »

GoPkgDoc hosts code documentation for this project.


  • Modular and flexible design
  • Hot restart hooks for zero-downtime deploys
  • Builtin statistics framework
  • Builtin logging framework


Falcore is a filter pipeline based HTTP server library. You can build arbitrarily complicated HTTP services by chaining just a few simple components:

  • RequestFilters are the core component. A request filter takes a request and returns a response or nil. Request filters can modify the request as it passes through.
  • ResponseFilters can modify a response on its way out the door. An example response filter, compression_filter, is included. It applies deflate or gzip compression to the response if the request supplies the proper headers.
  • Pipelines form one of the two logic components. A pipeline contains a list of RequestFilters and a list of ResponseFilters. A request is processed through the request filters, in order, until one returns a response. It then passes the response through each of the response filters, in order. A pipeline is a valid RequestFilter.
  • Routers allow you to conditionally follow different pipelines. A router chooses from a set of pipelines. A few basic routers are included, including routing by hostname or requested path. You can implement your own router by implementing falcore.Router. Routers are not RequestFilters, but they can be put into pipelines.


Falcore is currently targeted at Go 1.0. If you're still using Go r.60.x, you can get the last working version of falcore for r.60 using the tag last_r60.

Check out the project into $GOROOT/src/pkg/ Build using the go build command.


See the examples directory for usage examples.


To use falcore to serve HTTPS, simply call ListenAndServeTLS instead of ListenAndServe. If you want to host SSL and nonSSL out of the same process, simply create two instances of falcore.Server. You can give them the same pipeline or share pipeline components.