servant-exceptions alternatives and similar packages

Based on the "servant" category.
Alternatively, view servant-exceptions alternatives based on common mentions on social networks and blogs.

servant

10.0 8.8 servant-exceptions VS servant

Main repository for the servant libraries — DSL for describing, serving, querying, mocking, documenting web applications and more!
servant-elm

9.6 0.0 servant-exceptions VS servant-elm

Automatically derive Elm functions to query servant webservices

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servant-purescript

9.4 0.0 servant-exceptions VS servant-purescript

Translate servant API to purescript code, with the help of purescript-bridge.
servant-swagger

9.4 0.0 servant-exceptions VS servant-swagger

Swagger for Servant
servant-generic

9.0 0.0 servant-exceptions VS servant-generic

Specify Servant routes with records
servant-swagger-ui

8.9 0.0 servant-exceptions VS servant-swagger-ui

Provide embedded swagger UI for servant and swagger
servant-response

8.8 0.0 servant-exceptions VS servant-response

Moved to http://github.com/haskell-servant
servant-quickcheck

8.6 0.0 servant-exceptions VS servant-quickcheck

QuickCheck entire APIs
servant-snap

8.5 0.0 servant-exceptions VS servant-snap

Snap port of servant-server (WIP)
servant-js

8.3 0.0 servant-exceptions VS servant-js

Automatically derive javascript functions to query servant webservices.
servant-auth-cookie

8.3 0.0 servant-exceptions VS servant-auth-cookie

Authentication via encrypted cookies
servant-router

8.1 0.0 servant-exceptions VS servant-router

Servant router for non-server applications.
servant-subscriber

8.1 0.0 servant-exceptions VS servant-subscriber

When REST is not enough ...
servant-aeson-specs

8.1 0.0 servant-exceptions VS servant-aeson-specs

Generically obtain tests for JSON serialization
servant-lucid

7.8 0.0 servant-exceptions VS servant-lucid

Servant support for lucid
servant-cassava

7.6 2.6 servant-exceptions VS servant-cassava

Servant CSV content-type for cassava
servant-pandoc

7.4 0.0 servant-exceptions VS servant-pandoc

Render a servant API to Pandoc's native representation
servant-github-webhook

7.4 0.0 servant-exceptions VS servant-github-webhook

Servant combinators for writing secure GitHub webhooks
servant-cli

7.4 0.0 servant-exceptions VS servant-cli

Generate a command line client from a servant API
servant-pagination

7.3 0.0 servant-exceptions VS servant-pagination

Type-safe pagination for Servant APIs
servant-mock

7.3 0.0 servant-exceptions VS servant-mock

Derive a mock server for free from your servant API types
servant-matrix-param

7.2 0.0 servant-exceptions VS servant-matrix-param

Matrix parameter combinator for servant
servant-blaze

7.2 0.0 servant-exceptions VS servant-blaze

Blaze-html support for servant
servant-auth-token-acid

6.9 0.0 servant-exceptions VS servant-auth-token-acid

Servant based API and server for token based authorisation
servant-auth-token-leveldb

6.9 0.0 servant-exceptions VS servant-auth-token-leveldb

Servant based API and server for token based authorisation
servant-github

6.8 0.0 servant-exceptions VS servant-github

servant types to access the GitHub API v3
servant-py

6.6 0.0 servant-exceptions VS servant-py

Servant client generators for the Python language
servant-jsonrpc

6.2 0.0 servant-exceptions VS servant-jsonrpc

Tools to build JSON-RPC clients and servers the Servant way
servant-flatten

5.8 0.0 servant-exceptions VS servant-flatten

"Flatten" servant API types
servant-reason

5.8 0.0 servant-exceptions VS servant-reason

Automatically derive bindings for Servant APIs in Reason
servant-named

5.6 0.0 servant-exceptions VS servant-named

Add named endpoints to servant
servant-ede

5.6 0.0 servant-exceptions VS servant-ede

Support for ede templates in servant
servant-zeppelin

5.5 0.0 servant-exceptions VS servant-zeppelin

Server Side Loading JSON
servant-zeppelin-client

5.5 0.0 servant-exceptions VS servant-zeppelin-client

Server Side Loading JSON
servant-xml

5.3 0.0 servant-exceptions VS servant-xml

Servant support for the XML Content-Type.
servant-http2-client

4.4 0.0 servant-exceptions VS servant-http2-client

Generate http2-client from Servant APIs
servant-kotlin

4.4 0.0 servant-exceptions VS servant-kotlin

Automatically derive Kotlin functions to query servant webservices
servant-ruby

4.2 0.0 servant-exceptions VS servant-ruby

Create a Ruby client from a Servant API using Net::HTTP.
servant-match

3.9 0.0 servant-exceptions VS servant-match

Standalone implementation of servant’s dispatching mechanism
servant-options

3.7 0.0 servant-exceptions VS servant-options

Provide responses to OPTIONS requests for Servant applications.
servant-csharp

3.4 0.0 servant-exceptions VS servant-csharp

Generate servant client library for C#
servant-generate

2.1 0.0 servant-exceptions VS servant-generate

Generate default implementations for servers in a flexible way (a.k.a servant-mock on steroids)
servant-proto-lens

1.9 3.2 servant-exceptions VS servant-proto-lens

Servant Content-Type for proto-lens protobuf modules.
servant-iCalendar

1.8 0.0 servant-exceptions VS servant-iCalendar

servant support for iCalendar
servant-haxl-client

1.6 0.0 servant-exceptions VS servant-haxl-client

automatical derivation of querying functions for servant webservices
servant-wasm

1.5 0.0 servant-exceptions VS servant-wasm

Servant support for delivering WebAssembly
servant-pool

- - servant-exceptions VS servant-pool

...
servant-jsonrpc-client

- servant-exceptions VS servant-jsonrpc-client

Generate JSON-RPC servant clients
servant-multipart

- - servant-exceptions VS servant-multipart

multipart/form-data (e.g file upload) support for servant

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README

servant-exceptions

Servant servers typically run their handlers in some form of IO. Either directly in the builtin Handler monad or a custom monad transformer on top it. When APIs fail, one would typically use the MonadError ServantError instance via throwError to create an error response of type ServantErr.

This approach has two problems:

Handler (basically being ExceptT ServantErr IO) is considered an anti-pattern by some, as it suggests to novice users that only ServantErr would occur, but in IO any exception can be raised to abort execution
ServantErr values need to be created at the call site of throwError, where the requested content type and/or headers are not available

servant-exception tries to help with both by making it easy to catch specific error types with an instance of Exception and provide automatic encoding into the requested content-type.

The API combinator Throws e can be used to catch exceptions of type e in the server, for example:

type API = "api" :> Throws UsersError :> "users" :> Get '[JSON, PlainText] [User]

The type UsersError can then be used to describe expected errors and their conversion via type class instances:

data UsersError = UserNotFound
                | UserAlreadyExists
                | InternalError
                deriving (Show)

instance Exception UsersError

instance ToServantErr UsersError where
  status UserNotFound = status404
  status UserAlreadyExists = status409
  status InternalError = status500

instance ToJSON UsersError where
  toJSON e = object [ "type" .= show (typeOf e)
                    , "message" .= message e
                    ]

instance MimeRender PlainText UsersError where
  mimeRender ct = mimeRender ct . show