CHANGES

= 1.2.0 (2013-03-24)

 * Add `SSLPinningMode` property to `AFHTTPClient` (Oliver Letterer, Kevin
Harwood, Adam Becevello, Dustin Barker, Mattt Thompson)

 * Add single quote ("'"), comma (","), and asterix ("*") to escaped URL
encoding characters (Eric Florenzano, Marc Nijdam, Garrett Murray)

 * Add `credential` property to `AFURLConnectionOperation` (Mattt Thompson)

 * Add `-setDefaultCredential:` to `AFHTTPClient`

 * Add `shouldUseCredentialStorage` property to `AFURLConnectionOperation`
(Mattt Thompson)

 * Add support for repeated key value pairs in `AFHTTPClient` URL query string
(Nick Dawson)

 * Add `AFMultipartFormData -
appendPartWithFileURL:name:fileName:mimeType:error` (Daniel Rodríguez Troitiño)

 * Add `AFMultipartFormData -
appendPartWithInputStream:name:fileName:mimeType:` (@joein3d)

 * Change SSL pinning to be runtime property on `AFURLConnectionOperation`
rather than defined by macro (Oliver Letterer)

 * Change `AFMultipartBodyStream` to `AFMultipartBodyStreamProvider`, vending
one side of a bound CFStream pair rather than subclassing `NSInputStream` (Mike
Ash)

 * Change default `Accept-Language` header in `AFHTTPClient` (@therigu, Mattt
Thompson)

 * Change `AFHTTPClient` operation cancellation to be based on request URL path
rather than absolute URL string (Mattt Thompson)

 * Change request operation subclass processing queues to use
`DISPATCH_QUEUE_CONCURRENT` (Mattt Thompson)

 * Change `UIImageView+AFNetworking` to resolve asymmetry in cached image case
between success block provided and not provided (@Eveets, Mattt Thompson)

 * Change `UIImageView+AFNetworking` to compare `NSURLRequest` instead of
`NSURL` to determine if previous request was equivalent (Cédric Luthi)

 * Change `UIImageView+AFNetworking` to only set image if non-`nil` (Sean
Kovacs)

 * Change indentation settings to four spaces at the project level (Cédric
Luthi)

 * Change `AFNetworkActivityIndicatorManager` to only update if requests have a
non-`nil` URL (Cédric Luthi)

 * Change `UIImageView+AFNetworking` to not do `setHTTPShouldHandleCookies`
(Konstantinos Vaggelakos)

 * Fix request stream exhaustion error on authentication challenges (Alex
Burgel)

 * Fix implementation to use `NSURL` methods instead of `CFURL` functions where
applicable (Cédric Luthi)

 * Fix race condition in `UIImageView+AFNetworking` (Peyman)

 * Fix `responseJSON`, `responseString`, and `responseStringEncoding` to be
threadsafe (Jon Parise, Mattt Thompson)

 * Fix `AFContentTypeForPathExtension` to ensure non-`NULL` content return
value (Zach Waugh)

 * Fix documentation for `appendPartWithFileURL:name:error:`
 (Daniel Rodríguez Troitiño)

 * Fix request operation subclass processing queues to initialize with
`dispatch_once` (Sasmito Adibowo)

 * Fix posting of `AFNetworkingOperationDidStartNotification` and
`AFNetworkingOperationDidFinishNotification` to avoid crashes when logging in
response to notifications (Blake Watters)

 * Fix ordering of registered operation consultation in `AFHTTPClient` (Joel
Parsons)

 * Fix warning: multiple methods named 'postNotificationName:object:' found
[-Wstrict-selector-match] (Oliver Jones)

 * Fix warning: multiple methods named 'objectForKey:' found
[-Wstrict-selector-match] (Oliver Jones)

 * Fix warning: weak receiver may be unpredictably set to nil
[-Wreceiver-is-weak] (Oliver Jones)

 * Fix missing #pragma clang diagnostic pop (Steven Fisher)

= 1.1.0 (2012-12-27)

 * Add optional SSL certificate pinning with `#define
_AFNETWORKING_PIN_SSL_CERTIFICATES_` (Dustin Barker)

 * Add `responseStringEncoding` property to `AFURLConnectionOperation` (Mattt
Thompson)

 * Add `userInfo` property to `AFURLConnectionOperation` (Mattt Thompson,
Steven Fisher)

 * Change behavior to cause a failure when an operation is cancelled (Daniel
Tull)

 * Change return type of class constructors to `instancetype` (@guykogus)

 * Change notifications to always being posted on an asynchronously-dispatched
block run on the main queue (Evadne Wu, Mattt Thompson)

 * Change from NSLocalizedString to NSLocalizedStringFromTable with
AFNetworking.strings table for localized strings (Cédric Luthi)

 * Change `-appendPartWithHeaders:body:` to add assertion handler for existence
of body data parameter (Jonathan Beilin)

 * Change `AFHTTPRequestOperation -responseString` to follow guidelines from
RFC 2616 regarding the use of string encoding when none is specified in the
response (Jorge Bernal)

 * Change AFHTTPClient parameter serialization dictionary keys with
`caseInsensitiveCompare:` to ensure
 deterministic ordering of query string parameters, which may otherwise
 cause ambiguous representations of nested parameters (James Coleman,
 Mattt Thompson)

 * Fix -Wstrict-selector-match warnings raised by Xcode 4.6DP3 (Jesse Collis,
Cédric Luthi)

 * Fix NSJSONSerialization crash with Unicode character escapes in JSON
response (Mathijs Kadijk)

 * Fix issue with early return in -startMonitoringNetworkReachability if
network reachability object could not be created (i.e. invalid hostnames)
(Basil Shkara)

 * Fix retain cycles in AFImageRequestOperation.m and AFHTTPClient.m caused by
strong references within blocks (Nick Forge)

 * Fix issue caused by Rails behavior of returning a single space in head :ok
responses, which is interpreted as invalid (Sebastian Ludwig)

 * Fix issue in streaming multipart upload, where final encapsulation boundary
would not be appended if it was larger than the available buffer, causing a
potential timeout (Tomohisa Takaoka, David Kasper)

 * Fix memory leak of network reachability callback block (Mattt Thompson)

 * Fix `-initWithCoder:` for `AFURLConnectionOperation` and `AFHTTPClient` to
cast scalar types (Mattt Thompson)

 * Fix bug in `-enqueueBatchOfHTTPRequestOperations:...` to by using
`addOperations:waitUntilFinished:` instead of adding each operation
individually. (Mattt Thompson)

 * Change `#warning` messages of checks for `CoreServices` and
`MobileCoreServices` to message according to the build target platform (Mattt
Thompson)

 * Change `AFQueryStringFromParametersWithEncoding` to create keys string
representations using the description method as specified in documentation
(Cédric Luthi)

 * Fix __unused keywords for better Xcode indexing (Christian Rasmussen)

 * Fix warning: unused parameter 'x' [-Werror,-Wunused-parameter] (Oliver Jones)

 * Fix warning: property is assumed atomic by default
[-Werror,-Wimplicit-atomic-properties] (Oliver Jones)

 * Fix warning: weak receiver may be unpredictably null in ARC mode
[-Werror,-Wreceiver-is-weak] (Oliver Jones)

 * Fix warning: multiple methods named 'selector' found
[-Werror,-Wstrict-selector-match] (Oliver Jones)

 * Fix warning: 'macro' is not defined, evaluates to 0 (Oliver Jones)

 * Fix warning: atomic by default property 'X' has a user (Oliver Jones)defined
getter (property should be marked 'atomic' if this is intended) [-Werror,
-Wcustom-atomic-properties] (Oliver Jones)

 * Fix warning: 'response' was marked unused but was used
[-Werror,-Wused-but-marked-unused] (Oliver Jones)

 * Fix warning: enumeration value 'AFFinalBoundaryPhase' not explicitly handled
in switch [-Werror,-Wswitch-enum] (Oliver Jones)

= 1.0.1 / 2012-11-01

 * Fix error in multipart upload streaming, where byte range at boundaries
was not correctly calculated (Stan Chang Khin Boon)

 * If a success block is specified to `UIImageView -setImageWithURLRequest:
placeholderImage:success:failure`:, it is now the responsibility of the
block to set the image of the image view (Mattt Thompson)

 * Add `JSONReadingOptions` property to `AFJSONRequestOperation` (Jeremy
 Foo, Mattt Thompson)

 * Using __weak self / __strong self pattern to break retain cycles in
 background task and network reachability blocks (Jerry Beers, Dan Weeks)

 * Fix parameter encoding to leave period (`.`) unescaped (Diego Torres)

 * Fixing last file component in multipart form part creation (Sylver
 Bruneau)

 * Remove executable permission on AFHTTPClient source files (Andrew
 Sardone)

 * Fix warning (error with -Werror) on implicit 64 to 32 conversion (Dan
 Weeks)

 * Add GitHub's .gitignore file (Nate Stedman)

 * Updates to README (@ckmcc)

= 1.0 / 2012-10-15

 * AFNetworking now requires iOS 5 / Mac OSX 10.7 or higher (Mattt Thompson)

 * AFNetworking now uses Automatic Reference Counting (ARC) (Mattt Thompson)

 * AFNetworking raises compiler warnings for missing features when
SystemConfiguration or  CoreServices / MobileCoreServices frameworks are not
included in the project and imported in the precompiled headers (Mattt
Thompson)

 * AFNetworking now raises compiler error when not compiled with ARC (Steven
Fisher)

 * Add `NSCoding` and `NSCopying` protocol conformance to
`AFURLConnectionOperation` and `AFHTTPClient` (Mattt Thompson)

 * Add substantial improvements HTTP multipart streaming support, having
files streamed directly from disk and read sequentially from a custom input
stream (Max Lansing, Stan Chang Khin Boon, Mattt Thompson)

 * Add `AFMultipartFormData -throttleBandwidthWithPacketSize:delay:` as
workaround to issues when uploading over 3G (Mattt Thompson)

 * Add request and response to `userInfo` of errors returned from failing
`AFHTTPRequestOperation` (Mattt Thompson)

 * Add `userInfo` dictionary with current status in reachability changes
(Mattt Thompson)

 * Add `Accept` header for image requests in `UIImageView` category (Bratley
Lower)

 * Add explicit declaration of `NSURLConnection` delegate methods so that
they can be overridden in subclasses (Mattt Thompson, Evan Grim)

 * Add parameter validation to match conditions specified in documentation
(Jason Brennan, Mattt Thompson)

 * Add import to `UIKit` to avoid build errors from `UIDevice` references in
`User-Agent` default header (Blake Watters)

 * Remove `AFJSONUtilities` in favor of `NSJSONSerialization` (Mattt Thompson)

 * Remove `extern` declaration of `AFURLEncodedStringFromStringWithEncoding`
function (`CFURLCreateStringByAddingPercentEscapes` should be used instead)
(Mattt Thompson)

 * Remove `setHTTPShouldHandleCookies:NO` from `AFHTTPClient` (@phamsonha,
Mattt Thompson)

 * Remove `dispatch_retain` / `dispatch_release` with ARC in iOS 6 (Benoit
Bourdon)

 * Fix threading issue with `AFNetworkActivityIndicatorManager` (Eric Patey)

 * Fix issue where `AFNetworkActivityIndicatorManager` count could become
negative (@ap4y)

 * Fix properties to explicitly set options to suppress warnings (Wen-Hao
Lue, Mattt Thompson)

 * Fix compiler warning caused by mismatched types in upload / download
progress blocks (Gareth du Plooy, tomas.a)

 * Fix weak / strong variable relationships in `completionBlock` (Peter
Steinberger)

 * Fix string formatting syntax warnings caused by type mismatch (David
Keegan, Steven Fisher, George Cox)

 * Fix minor potential security vulnerability by explicitly using string
format in NSError localizedDescription value in userInfo (Steven Fisher)

 * Fix `AFURLConnectionOperation -pause` by adding state checks to prevent
likely memory issues when resuming (Mattt Thompson)

 * Fix warning caused by miscast of type when
`CLANG_WARN_IMPLICIT_SIGN_CONVERSION` is set (Steven Fisher)

 * Fix incomplete implementation warning in example code (Steven Fisher)

 * Fix warning caused by using `==` comparator on floats (Steven Fisher)

 * Fix iOS 4 bug where file URLs return `NSURLResponse` rather than
`NSHTTPURLResponse` objects (Leo Lobato)

 * Fix calculation of finished operations in batch operation progress
callback (Mattt Thompson)

 * Fix documentation typos (Steven Fisher, Matthias Wessendorf,
jorge@miv.uk.com)

 * Fix `hasAcceptableStatusCode` to return true after a network failure (Tony
Million)

 * Fix warning about missing prototype for private static method (Stephan
Diederich)

 * Fix issue where `nil` content type resulted in unacceptable content type
(Mattt Thompson)

 * Fix bug related to setup and scheduling of output stream (Stephen Tramer)

 * Fix AFContentTypesFromHTTPHeader to correctly handle comma-delimited
content types (Peyman, Mattt Thompson, @jsm174)

 * Fix crash caused by `_networkReachability` not being set to `NULL` after
releasing (Blake Watters)

 * Fix Podspec to correctly import required headers and use ARC (Eloy Durán,
Blake Watters)

 * Fix query string parameter escaping to leave square brackets unescaped
(Mattt Thompson)

 * Fix query string parameter encoding of `NSNull` values (Daniel Rinser)

 * Fix error caused by referencing `__IPHONE_OS_VERSION_MIN_REQUIRED` without
importing `Availability.h` (Blake Watters)

 * Update example to use App.net API, as Twitter shut off its unauthorized
access to the public timeline (Mattt Thompson)

 * Update `AFURLConnectionOperation` to replace `NSAutoReleasePool` with
`@autoreleasepool` (Mattt Thompson)

 * Update `AFHTTPClient` operation queue to specify
`NSOperationQueueDefaultMaxConcurrentOperationCount` rather than
previously-defined constant (Mattt Thompson)

 * Update `AFHTTPClient -initWithBaseURL` to automatically append trailing
slash, so as to fix common issue where default path is not respected without
trailing slash (Steven Fisher)

 * Update default `AFHTTPClient` `User-Agent` header strings (Mattt Thompson,
Steven Fisher)

 * Update icons for iOS example application (Mattt Thompson)

 * Update `numberOfCompletedOperations` variable in progress block to be
renamed to `numberOfFinishedOperations` (Mattt Thompson)


= 0.10.0 / 2012-06-26

 * Add Twitter Mac Example application (Mattt Thompson)

 * Add note in README about how to set `-fno-objc-arc` flag for multiple files
 at once (Pål Brattberg)

 * Add note in README about 64-bit architecture requirement (@rmuginov, Mattt
 Thompson)

 * Add note in `AFNetworkActivityIndicatorManager` about not having to manually
 manage animation state (Mattt Thompson)

 * Add missing block parameter name for `imageProcessingBlock` (Francois
 Lambert)

 * Add NextiveJson to list of supported JSON libraries (Mattt Thompson)

 * Restore iOS 4.0 compatibility with `addAcceptableStatusCodes:` and
 `addAcceptableContentTypes:` (Zachary Waldowski)

 * Update `AFHTTPClient` to use HTTP pipelining for `GET` and `HEAD` requests by
 default (Mattt Thompson)

 * Remove @private ivar declaration in headers (Peter Steinberger, Mattt
 Thompson)

 * Fix potential premature deallocation of _skippedCharacterSet (Tom Wanielista,
 Mattt Thompson)

 * Fix potential issue in `setOutputStream` by closing any existing
 `outputStream` (Mattt Thompson)

 * Fix filename in AFHTTPClient header (Steven Fisher)

 * Fix documentation for UIImageView+AFNetworking (Mattt Thompson)

 * Fix HTTP multipart form format, which caused issues with Tornado web server
 (Matt Chen)

 * Fix `AFHTTPClient` to not append empty data into multipart form data (Jon
 Parise)

 * Fix URL encoding normalization to not conditionally escape percent-encoded
 strings (João Prado Maia, Kendall Helmstetter Gelner, @cysp, Mattt Thompson)

 * Fix `AFHTTPClient` documentation reference of
 `HTTPRequestOperationWithRequest:success:failure` (Shane Vitarana)

 * Add `AFURLRequestOperation -setRedirectResponseBlock:` (Kevin Harwood)

 * Fix `AFURLConnectionOperation` compilation error by conditionally importing
 UIKit framework (Steven Fisher)

 * Fix issue where image processing block is not called correctly with success
 block in `AFImageRequestOperation` (Sergey Gavrilyuk)

 * Fix leaked dispatch group in batch operations (@andyegorov, Mattt Thompson)

 * Fix support for non-LLVM compilers in `AFNetworkActivityIndicatorManager`
 (Abraham Vegh, Bill Williams, Mattt Thompson)

 * Fix AFHTTPClient to not add unnecessary data when constructing multipart form
 request with nil parameters (Taeho Kim)

= 1.0RC1 / 2012-04-25

 * Add `AFHTTPRequestOperation +addAcceptableStatusCodes /
+addAcceptableContentTypes` to dynamically add acceptable status codes and
content types on the class level (Mattt Thompson)

 * Add support for compound and complex `Accept` headers that include multiple
content types and / or specify a particular character encoding (Mattt Thompson)

 * Add `AFURLConnectionOperation
-setShouldExecuteAsBackgroundTaskWithExpirationHandler:` to have operations
finish once an app becomes inactive (Mattt Thompson)

 * Add support for pausing / resuming request operations (Peter Steinberger,
Mattt Thompson)

 * Improve network reachability functionality in `AFHTTPClient`, including a
distinction between WWan and WiFi reachability (Kevin Harwood, Mattt Thompson)


= 0.9.2 / 2012-04-25

 * Add thread safety to `AFNetworkActivityIndicator` (Peter Steinberger, Mattt
Thompson)

 * Document requirement of available JSON libraries for decoding responses in
`AFJSONRequestOperation` and parameter encoding in `AFHTTPClient` (Mattt
Thompson)

 * Fix `AFHTTPClient` parameter encoding (Mattt Thompson)

 * Fix `AFJSONEncode` and `AFJSONDecode` to use `SBJsonWriter` and
`SBJsonParser` instead of `NSObject+SBJson` (Oliver Eikemeier)

 * Fix bug where `AFJSONDecode` does not return errors (Alex Michaud)

 * Fix compiler warning for undeclared
`AFQueryStringComponentFromKeyAndValueWithEncoding` function (Mattt Thompson)

 * Fix cache policy for URL requests (Peter Steinberger)

 * Fix race condition bug in `UIImageView+AFNetworking` caused by incorrectly
nil-ing request operations (John Wu)

 * Fix reload button in Twitter example (Peter Steinberger)

 * Improve batched operation by deferring execution of batch completion block
until all component request completion blocks have finished (Patrick Hernandez,
Kevin Harwood, Mattt Thompson)

 * Improve performance of image request decoding by dispatching to background
 queue (Mattt Thompson)

 * Revert `AFImageCache` to cache image objects rather than `NSPurgeableData`
(Tony Million, Peter Steinberger, Mattt Thompson)

 * Remove unnecessary KVO `willChangeValueForKey:` / `didChangeValueForKey:`
calls (Peter Steinberger)

 * Remove unnecessary @private ivar declarations in headers (Peter Steinberger,
Mattt Thompson)

 * Remove @try-@catch block wrapping network thread entry point (Charles T. Ahn)


= 0.9.1 / 2012-03-19

 * Create Twitter example application (Mattt Thompson)

 * Add support for nested array and dictionary parameters for query string and
form-encoded requests (Mathieu Hausherr, Josh Chung, Mattt Thompson)

 * Add `AFURLConnectionOperation -setCacheResponseBlock:`, which allows the
behavior of the `NSURLConnectionDelegate` method
`-connection:willCacheResponse:` to be overridden without subclassing (Mattt
Thompson)

 * Add `_AFNETWORKING_ALLOW_INVALID_SSL_CERTIFICATES_` macros for
NSURLConnection authentication delegate methods (Mattt Thompson)

 * Add properties for custom success / failure callback queues (Peter
Steinberger)

 * Add notifications for network reachability changes to `AFHTTPClient` (Mattt
Thompson)

 * Add `AFHTTPClient -patchPath:` convenience method (Mattt Thompson)

 * Add support for NextiveJson (Adrian Kosmaczewski)

 * Improve network reachability checks (C. Bess)

 * Improve NSIndexSet formatting in error strings (Jon Parise)

 * Document crashing behavior in iOS 4 loading a file:// URL (Mattt Thompson)

 * Fix crash caused by `AFHTTPClient -cancelAllHTTPOperationsWithMethod:` not
checking operation to be instance of `AFHTTPRequestOperation` (Mattt Thompson)

 * Fix crash caused by passing `nil` URL in requests (Sam Soffes)

 * Fix errors caused by connection property not being nil'd out after an
operation finishes (Kevin Harwood, @zdzisiekpu)

 * Fix crash caused by passing `NULL` error pointer when setting `NSInvocation`
in `AFJSONEncode` and `AFJSONDecode` (Tyler Stromberg)

 * Fix batch operation completion block returning on background thread (Patrick
Hernandez)

 * Fix documentation for UIImageView+AFNetworking (Dominic Dagradi)

 * Fix race condition caused by `AFURLConnectionOperation` being cancelled on
main thread, rather than network thread (Erik Olsson)

 * Fix `AFURLEncodedStringFromStringWithEncoding` to correctly handle cases
where % is used as a literal rather than as part of a percent escape code
(Mattt Thompson)

 * Fix missing comma in `+defaultAcceptableContentTypes` for
`AFImageRequestOperation` (Michael Schneider)


= 0.9.0 / 2012-01-23

 * Add thread-safe behavior to `AFURLConnectionOperation` (Mattt Thompson)

 * Add batching of operations for `AFHTTPClient` (Mattt Thompson)

 * Add authentication challenge callback block to override default
 implementation of `connection:didReceiveAuthenticationChallenge:` in
 `AFURLConnectionOperation` (Mattt Thompson)

 * Add `_AFNETWORKING_PREFER_NSJSONSERIALIZATION_`, which, when defined,
 short-circuits the standard preference ordering used in `AFJSONEncode` and
 `AFJSONDecode` to use `NSJSONSerialization` when available, falling back on
 third-party-libraries. (Mattt Thompson, Shane Vitarana)

 * Add custom `description` for `AFURLConnectionOperation` and `AFHTTPClient`
 (Mattt Thompson)

 * Add `text/javascript` to default acceptable content types for
 `AFJSONRequestOperation` (Jake Boxer)

 * Add `imageScale` property to change resolution of images constructed from
 cached data (Štěpán Petrů)

 * Add note about third party JSON libraries in README (David Keegan)

 * `AFQueryStringFromParametersWithEncoding` formats `NSArray` values in the
 form `key[]=value1&key[]=value2` instead of `key=(value1,value2)` (Dan Thorpe)

 * `AFImageRequestOperation -responseImage` on OS X uses `NSBitmapImageRep` to
 determine the correct pixel dimensions of the image (David Keegan)

 * `AFURLConnectionOperation` `connection` has memory management policy `assign`
 to avoid retain cycles caused by `NSURLConnection` retaining its delegate
 (Mattt Thompson)

 * `AFURLConnectionOperation` calls super implementation for `-isReady`,
 following the guidelines for `NSOperation` subclasses (Mattt Thompson)

 * `UIImageView -setImageWithURL:` and related methods call success callback
 after setting image (Cameron Boehmer)

 * Cancel request if an authentication challenge has no suitable credentials in
 `AFURLConnectionOperation -connection:didReceiveAuthenticationChallenge:`
 (Jorge Bernal)

 * Remove exception from
 `multipartFormRequestWithMethod:path:parameters:constructing BodyWithBlock:`
 raised when certain HTTP methods are used. (Mattt Thompson)

 * Remove `AFImageCache` from public API, moving it into private implementation
 of `UIImageView+AFNetworking` (Mattt Thompson)

 * Mac example application makes better use of AppKit technologies and
 conventions (Mattt Thompson)

 * Fix issue with multipart form boundaries in `AFHTTPClient
 -multipartFormRequestWithMethod:path:parameters:constructing BodyWithBlock:`
 (Ray Morgan, Mattt Thompson, Sam Soffes)

 * Fix "File Upload with Progress Callback" code snippet in README (Larry Legend)

 * Fix to SBJSON invocations in `AFJSONEncode` and `AFJSONDecode` (Matthias
 Tretter, James Frye)

 * Fix documentation for `AFHTTPClient requestWithMethod:path:parameters:`
 (Michael Parker)

 * Fix `Content-Disposition` headers used for multipart form construction
 (Michael Parker)

 * Add network reachability status change callback property to `AFHTTPClient`.
 (Mattt Thompson, Kevin Harwood)

 * Fix exception handling in `AFJSONEncode` and `AFJSONDecode` (David Keegan)

 * Fix `NSData` initialization with string in `AFBase64EncodedStringFromString`
 (Adam Ernst, Mattt Thompson)

 * Fix error check in `appendPartWithFileURL:name:error:` (Warren Moore,
 Baldoph, Mattt Thompson)

 * Fix compiler warnings for certain configurations (Charlie Williams)

 * Fix bug caused by passing zero-length `responseData` to response object
 initializers (Mattt Thompson, Serge Paquet)