Alamofire is an HTTP networking library written in Swift, from the creator of AFNetworking.
- Chainable Request / Response methods
- URL / JSON / plist Parameter Encoding
- Upload File / Data / Stream
- Download using Request or Resume data
- Authentication with NSURLCredential
- HTTP Response Validation
- Progress Closure & NSProgress
- cURL Debug Output
- Comprehensive Unit Test Coverage
- Complete Documentation
- iOS 7.0+ / Mac OS X 10.9+
- Xcode 6.0
For Xcode 6.1, use the
xcode-6.1
branch.
- If you need help, use Stack Overflow. (Tag 'alamofire')
- If you'd like to ask a general question, use Stack Overflow.
- If you found a bug, open an issue.
- If you have a feature request, open an issue.
- If you want to contribute, submit a pull request.
Due to the current lack of proper infrastructure for Swift dependency management, using Alamofire in your project requires the following steps:
- Add Alamofire as a submodule by opening the Terminal,
cd
-ing into your top-level project directory, and entering the commandgit submodule add https://github.com/Alamofire/Alamofire.git
- Open the
Alamofire
folder, and dragAlamofire.xcodeproj
into the file navigator of your Xcode project. - In Xcode, navigate to the target configuration window by clicking on the blue project icon, and selecting the application target under the "Targets" heading in the sidebar.
- In the tab bar at the top of that window, open the "Build Phases" panel.
- Expand the "Link Binary with Libraries" group, and add
Alamofire.framework
. - Click on the
+
button at the top left of the panel and select "New Copy Files Phase". Rename this new phase to "Copy Frameworks", set the "Destination" to "Frameworks", and addAlamofire.framework
.
Alamofire.request(.GET, "http://httpbin.org/get")
Alamofire.request(.GET, "http://httpbin.org/get", parameters: ["foo": "bar"])
.response { (request, response, data, error) in
println(request)
println(response)
println(error)
}
Networking in Alamofire is done asynchronously. Asynchronous programming may be a source of frustration to programmers unfamiliar with the concept, but there are very good reasons for doing it this way.
Rather than blocking execution to wait for a response from the server, a callback is specified to handle the response once it's received. The result of a request is only available inside the scope of a response handler. Any execution contingent on the response or data received from the server must be done within a handler.
Built-in Response Methods
response()
responseString(encoding: NSStringEncoding)
responseJSON(options: NSJSONReadingOptions)
responsePropertyList(options: NSPropertyListReadOptions)
Alamofire.request(.GET, "http://httpbin.org/get")
.responseString { (_, _, string, _) in
println(string)
}
Alamofire.request(.GET, "http://httpbin.org/get")
.responseJSON { (_, _, JSON, _) in
println(JSON)
}
Response handlers can even be chained:
Alamofire.request(.GET, "http://httpbin.org/get")
.responseString { (_, _, string, _) in
println(string)
}
.responseJSON { (_, _, JSON, _) in
println(JSON)
}
Alamofire.Method
lists the HTTP methods defined in RFC 7231 §4.3:
public enum Method: String {
case OPTIONS = "OPTIONS"
case GET = "GET"
case HEAD = "HEAD"
case POST = "POST"
case PUT = "PUT"
case PATCH = "PATCH"
case DELETE = "DELETE"
case TRACE = "TRACE"
case CONNECT = "CONNECT"
}
These values can be passed as the first argument of the Alamofire.request
method:
Alamofire.request(.POST, "http://httpbin.org/post")
Alamofire.request(.PUT, "http://httpbin.org/put")
Alamofire.request(.DELETE, "http://httpbin.org/delete")
Alamofire.request(.GET, "http://httpbin.org/get", parameters: ["foo": "bar"])
// http://httpbin.org/get?foo=bar
let parameters = [
"foo": "bar",
"baz": ["a", 1],
"qux": [
"x": 1,
"y": 2,
"z": 3
]
]
Alamofire.request(.POST, "http://httpbin.org/post", parameters: parameters)
// HTTP body: foo=bar&baz[]=a&baz[]=1&qux[x]=1&qux[y]=2&qux[z]=3
Parameters can also be encoded as JSON, Property List, or any custom format, using the ParameterEncoding
enum:
enum ParameterEncoding {
case URL
case JSON
case PropertyList(format: NSPropertyListFormat,
options: NSPropertyListWriteOptions)
func encode(request: NSURLRequest,
parameters: [String: AnyObject]?) ->
(NSURLRequest, NSError?)
{ ... }
}
URL
: A query string to be set as or appended to any existing URL query forGET
,HEAD
, andDELETE
requests, or set as the body for requests with any other HTTP method. TheContent-Type
HTTP header field of an encoded request with HTTP body is set toapplication/x-www-form-urlencoded
. Since there is no published specification for how to encode collection types, the convention of appending[]
to the key for array values (foo[]=1&foo[]=2
), and appending the key surrounded by square brackets for nested dictionary values (foo[bar]=baz
).JSON
: UsesNSJSONSerialization
to create a JSON representation of the parameters object, which is set as the body of the request. TheContent-Type
HTTP header field of an encoded request is set toapplication/json
.PropertyList
: UsesNSPropertyListSerialization
to create a plist representation of the parameters object, according to the associated format and write options values, which is set as the body of the request. TheContent-Type
HTTP header field of an encoded request is set toapplication/x-plist
.Custom
: Uses the associated closure value to construct a new request given an existing request and parameters.
let URL = NSURL(string: "http://httpbin.org/get")
var request = NSURLRequest(URL: URL)
let parameters = ["foo": "bar"]
let encoding = Alamofire.ParameterEncoding.URL
(request, _) = encoding.encode(request, parameters)
let parameters = [
"foo": [1,2,3],
"bar": [
"baz": "qux"
]
]
Alamofire.request(.POST, "http://httpbin.org/post", parameters: parameters, encoding: .JSON)
// HTTP body: {"foo": [1, 2, 3], "bar": {"baz": "qux"}}
Caching is handled on the system framework level by NSURLCache
.
Supported Upload Types
- File
- Data
- Stream
let fileURL = NSBundle.mainBundle()
.URLForResource("Default",
withExtension: "png")
Alamofire.upload(.POST, "http://httpbin.org/post", file: fileURL)
Alamofire.upload(.POST, "http://httpbin.org/post", file: fileURL)
.progress { (bytesWritten, totalBytesWritten, totalBytesExpectedToWrite) in
println(totalBytesWritten)
}
.responseJSON { (request, response, JSON, error) in
println(JSON)
}
Supported Download Types
- Request
- Resume Data
Alamofire.download(.GET, "http://httpbin.org/stream/100", destination: { (temporaryURL, response) in
if let directoryURL = NSFileManager.defaultManager()
.URLsForDirectory(.DocumentDirectory,
inDomains: .UserDomainMask)[0]
as? NSURL {
let pathComponent = response.suggestedFilename
return directoryURL.URLByAppendingPathComponent(pathComponent!)
}
return temporaryURL
})
let destination = Alamofire.Request.suggestedDownloadDestination(directory: .DocumentDirectory, domain: .UserDomainMask)
Alamofire.download(.GET, "http://httpbin.org/stream/100", destination: destination)
Alamofire.download(.GET, "http://httpbin.org/stream/100", destination: destination)
.progress { (bytesRead, totalBytesRead, totalBytesExpectedToRead) in
println(totalBytesRead)
}
.response { (request, response, _, error) in
println(response)
}
Authentication is handled on the system framework level by NSURLCredential
and NSURLAuthenticationChallenge
.
Supported Authentication Schemes
let user = "user"
let password = "password"
Alamofire.request(.GET, "https://httpbin.org/basic-auth/\(user)/\(password)")
.authenticate(user: user, password: password)
.response {(request, response, _, error) in
println(response)
}
let user = "user"
let password = "password"
let credential = NSURLCredential(user: user, password: password, persistence: .ForSession)
Alamofire.request(.GET, "https://httpbin.org/basic-auth/\(user)/\(password)")
.authenticate(usingCredential: credential)
.response {(request, response, _, error) in
println(response)
}
By default, Alamofire treats any completed request to be successful, regardless of the content of the response. Calling validate
before a response handler causes an error to be generated if the response had an unacceptable status code or MIME type.
Alamofire.request(.GET, "http://httpbin.org/get", parameters: ["foo": "bar"])
.validate(statusCode: 200..<300)
.validate(contentType: ["application/json"])
.response { (_, _, _, error) in
println(error)
}
Automatically validates status code within 200...299
range, and that the Content-Type
header of the response matches the Accept
header of the request, if one is provided.
Alamofire.request(.GET, "http://httpbin.org/get", parameters: ["foo": "bar"])
.validate()
.response { (_, _, _, error) in
println(error)
}
let request = Alamofire.request(.GET, "http://httpbin.org/ip")
println(request)
// GET http://httpbin.org/ip (200)
let request = Alamofire.request(.GET, "http://httpbin.org/get", parameters: ["foo": "bar"])
debugPrintln(request)
$ curl -i \
-H "User-Agent: Alamofire" \
-H "Accept-Encoding: Accept-Encoding: gzip;q=1.0,compress;q=0.5" \
-H "Accept-Language: en;q=1.0,fr;q=0.9,de;q=0.8,zh-Hans;q=0.7,zh-Hant;q=0.6,ja;q=0.5" \
"http://httpbin.org/get?foo=bar"
Alamofire is built on
NSURLSession
and the Foundation URL Loading System. To make the most of this framework, it is recommended that you be familiar with the concepts and capabilities of the underlying networking stack.
Recommended Reading
- URL Loading System Programming Guide
- NSURLSession Class Reference
- NSURLCache Class Reference
- NSURLAuthenticationChallenge Class Reference
Top-level convenience methods like Alamofire.request
use a shared instance of Alamofire.Manager
, which is configured with the default NSURLSessionConfiguration
.
As such, the following two statements are equivalent:
Alamofire.request(.GET, "http://httpbin.org/get")
let manager = Alamofire.Manager.sharedInstance
manager.request(NSURLRequest(URL: NSURL(string: "http://httpbin.org/get")))
Applications can create managers for background and ephemeral sessions, as well as new managers that customize the default session configuration, such as for default headers (HTTPAdditionalHeaders
) or timeout interval (timeoutIntervalForRequest
).
let configuration = NSURLSessionConfiguration.defaultSessionConfiguration()
let manager = Alamofire.Manager(configuration: configuration)
let configuration = NSURLSessionConfiguration.backgroundSessionConfiguration("com.example.app.background")
let manager = Alamofire.Manager(configuration: configuration)
let configuration = NSURLSessionConfiguration.ephemeralSessionConfiguration()
let manager = Alamofire.Manager(configuration: configuration)
var defaultHeaders = Alamofire.Manager.sharedInstance.session.configuration.HTTPAdditionalHeaders ?? [:]
defaultHeaders["DNT"] = "1 (Do Not Track Enabled)"
let configuration = NSURLSessionConfiguration.defaultSessionConfiguration()
configuration.HTTPAdditionalHeaders = defaultHeaders
let manager = Alamofire.Manager(configuration: configuration)
This is not recommended for
Authorization
orContent-Type
headers. Instead, useURLRequestConvertible
andParameterEncoding
, respectively.
The result of a request
, upload
, or download
method is an instance of Alamofire.Request
. A request is always created using a constructor method from an owning manager, and never initialized directly.
Methods like authenticate
, validate
, and response
return the caller in order to facilitate chaining.
Requests can be suspended, resumed, and cancelled:
suspend()
: Suspends the underlying task and dispatch queueresume()
: Resumes the underlying task and dispatch queue. If the owning manager does not havestartRequestsImmediately
set totrue
, the request must callresume()
in order to start.cancel()
: Cancels the underlying task, producing an error that is passed to any registered response handlers.
Alamofire provides built-in response serialization for strings, JSON, and property lists, but others can be added in extensions on Alamofire.Request
.
For example, here's how a response handler using Ono might be implemented:
extension Request {
class func XMLResponseSerializer() -> Serializer {
return { (request, response, data) in
if data == nil {
return (nil, nil)
}
var XMLSerializationError: NSError?
let XML = ONOXMLDocument.XMLDocumentWithData(data, &XMLSerializationError)
return (XML, XMLSerializationError)
}
}
func responseXMLDocument(completionHandler: (NSURLRequest, NSHTTPURLResponse?, OnoXMLDocument?, NSError?) -> Void) -> Self {
return response(serializer: Request.XMLResponseSerializer(), completionHandler: { (request, response, XML, error) in
completionHandler(request, response, XML, error)
})
}
}
Generics can be used to provide automatic, type-safe response object serialization.
@objc public protocol ResponseObjectSerializable {
init(response: NSHTTPURLResponse, representation: AnyObject)
}
extension Alamofire.Request {
public func responseObject<T: ResponseObjectSerializable>(completionHandler: (NSURLRequest, NSHTTPURLResponse?, T?, NSError?) -> Void) -> Self {
let serializer: Serializer = { (request, response, data) in
let JSONSerializer = Request.JSONResponseSerializer(options: .AllowFragments)
let (JSON: AnyObject?, serializationError) = JSONSerializer(request, response, data)
if response != nil && JSON != nil {
return (T(response: response!, representation: JSON!), nil)
} else {
return (nil, serializationError)
}
}
return response(serializer: serializer, completionHandler: { (request, response, object, error) in
completionHandler(request, response, object as? T, error)
})
}
}
class User: ResponseObjectSerializable {
let username: String
let name: String
required init(response: NSHTTPURLResponse, representation: AnyObject) {
self.username = response.URL!.lastPathComponent
self.name = representation.valueForKeyPath("name") as String
}
}
Alamofire.request(.GET, "http://example.com/users/mattt")
.responseObject { (_, _, user: User?, _) in
println(user)
}
The same approach can also be used to handle endpoints that return a representation of a collection of objects:
@objc public protocol ResponseCollectionSerializable {
class func collection(#response: NSHTTPURLResponse, representation: AnyObject) -> [Self]
}
extension Alamofire.Request {
public func responseCollection<T: ResponseCollectionSerializable>(completionHandler: (NSURLRequest, NSHTTPURLResponse?, [T]?, NSError?) -> Void) -> Self {
let serializer: Serializer = { (request, response, data) in
let JSONSerializer = Request.JSONResponseSerializer(options: .AllowFragments)
let (JSON: AnyObject?, serializationError) = JSONSerializer(request, response, data)
if response != nil && JSON != nil {
return (T.collection(response: response!, representation: JSON!), nil)
} else {
return (nil, serializationError)
}
}
return response(serializer: serializer, completionHandler: { (request, response, object, error) in
completionHandler(request, response, object as? [T], error)
})
}
}
Types adopting the URLStringConvertible
protocol can be used to construct URL strings, which are then used to construct URL requests. Top-level convenience methods taking a URLStringConvertible
argument are provided to allow for type-safe routing behavior.
Applications interacting with web applications in a significant manner are encouraged to adopt either URLStringConvertible
or URLRequestConvertible
as a way to ensure consistency of requested endpoints.
enum Router: URLStringConvertible {
static let baseURLString = "http://example.com"
case Root
case User(String)
case Post(Int, Int, String)
// MARK: URLStringConvertible
var URLString: String {
let path: String = {
switch self {
case .Root:
return "/"
case .User(let username):
return "/users/\(username)"
case .Post(let year, let month, let title):
let slug = title.stringByReplacingOccurrencesOfString(" ", withString: "-").lowercaseString
return "/\(year)/\(month)/\(slug)"
}
}()
return Router.baseURLString + path
}
}
Alamofire.request(.GET, Router.User("mattt"))
Types adopting the URLRequestConvertible
protocol can be used to construct URL requests. Like URLStringConvertible
, this is recommended for applications with any significant interactions between client and server.
Top-level and instance methods on Manager
taking URLRequestConvertible
arguments are provided as a way to provide type-safe routing. Such an approach can be used to abstract away server-side inconsistencies, as well as manage authentication credentials and other state.
enum Router: URLRequestConvertible {
static let baseURLString = "http://example.com"
static let perPage = 50
case Search(query: String, page: Int)
// MARK: URLRequestConvertible
var URLRequest: NSURLRequest {
let (path: String, parameters: [String: AnyObject]?) = {
switch self {
case .Search(let query, let page) where page > 1:
return ("/search", ["q": query, "offset": Router.perPage * page])
case .Search(let query, _):
return ("/search", ["q": query])
}
}()
let URL = NSURL(string: Router.baseURLString)
let URLRequest = NSURLRequest(URL: URL.URLByAppendingPathComponent(path))
let encoding = Alamofire.ParameterEncoding.URL
return encoding.encode(URLRequest, parameters: parameters).0
}
}
Alamofire.request(Router.Search(query: "foo bar", page: 1)) // ?q=foo+bar&offset=50
enum Router: URLRequestConvertible {
static let baseURLString = "http://example.com"
static var OAuthToken: String?
case CreateUser([String: AnyObject])
case ReadUser(String)
case UpdateUser(String, [String: AnyObject])
case DestroyUser(String)
var method: Alamofire.Method {
switch self {
case .CreateUser:
return .POST
case .ReadUser:
return .GET
case .UpdateUser:
return .PUT
case .DestroyUser:
return .DELETE
}
}
var path: String {
switch self {
case .CreateUser:
return "/users"
case .ReadUser(let username):
return "/users/\(username)"
case .UpdateUser(let username, _):
return "/users/\(username)"
case .DestroyUser(let username):
return "/users/\(username)"
}
}
// MARK: URLRequestConvertible
var URLRequest: NSURLRequest {
let URL = NSURL(string: Router.baseURLString)
let mutableURLRequest = NSMutableURLRequest(URL: URL.URLByAppendingPathComponent(path))
mutableURLRequest.HTTPMethod = method.toRaw()
if let token = Router.OAuthToken {
mutableURLRequest.setValue("Bearer \(token)", forHTTPHeaderField: "Authorization")
}
switch self {
case .CreateUser(let parameters):
return Alamofire.ParameterEncoding.JSON.encode(mutableURLRequest, parameters: parameters).0
case .UpdateUser(_, let parameters):
return Alamofire.ParameterEncoding.URL.encode(mutableURLRequest, parameters: parameters).0
default:
return mutableURLRequest
}
}
}
Alamofire.request(Router.ReadUser("mattt")) // GET /users/mattt
If you're starting a new project in Swift, and want to take full advantage of its conventions and language features, Alamofire is a great choice. Although not as fully-featured as AFNetworking, Alamofire is much nicer to work with, and should satisfy the vast majority of networking use cases.
It's important to note that two libraries aren't mutually exclusive: AFNetworking and Alamofire can peacefully exist in the same code base.
AFNetworking remains the premiere networking library available for OS X and iOS, and can easily be used in Swift, just like any other Objective-C code. AFNetworking is stable and reliable, and isn't going anywhere.
Use AFNetworking for any of the following:
- UIKit extensions, such as asynchronously loading images to
UIImageView
- TLS verification, using
AFSecurityManager
- Situations requiring
NSOperation
orNSURLConnection
, usingAFURLConnectionOperation
- Network reachability monitoring, using
AFNetworkReachabilityManager
- Multipart HTTP request construction, using
AFHTTPRequestSerializer
Alamofire is named after the Alamo Fire flower, a hybrid variant of the Bluebonnet, the official state flower of Texas.
Follow AFNetworking on Twitter (@AFNetworking)
Alamofire is released under the MIT license. See LICENSE for details.