2016-03-06 19:52:32 +02:00
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---
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title: Migrating
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menu:
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side:
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parent: guide
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weight: 2
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---
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### Migrating from v1
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2016-03-08 18:14:25 +02:00
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#### Change log
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2016-03-06 19:52:32 +02:00
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- Echo now uses `Engine` interface to abstract `HTTP` server implementation, allowing
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2016-03-08 18:14:25 +02:00
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us to use HTTP servers beyond the standard library. It currently supports standard HTTP server and [FastHTTP](https://github.com/valyala/fasthttp).
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- Context, Request and Response are converted to interfaces. [More...](https://github.com/labstack/echo/issues/146)
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2016-03-06 19:52:32 +02:00
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- Moved API's for serving static files into middleware.
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- `Echo#Index`
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- `Echo#Favicon`
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- `Echo#Static`
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- `Echo#ServeDir`
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- `Echo#ServeFile`
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- Dropped auto wrapping of handler and middleware to enforce compile time check.
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- Handler only accepts `Echo#Handler` interface.
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- Middleware only accepts `Echo#Middleware` interface.
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- `Echo#HandlerFunc` adapter to use of ordinary functions as handlers.
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- `Echo#MiddlewareFunc` adapter to use of ordinary functions as middleware.
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- Middleware is run before hitting the router, which doesn't require `Echo#Hook` API as
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it can be achieved via middleware.
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- Ability to define middleware at route level.
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#### How?
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