Easy to use CFNetwork wrapper for HTTP requests, Objective-C, Mac OS X and iPhone ASIHTTPRequest Documentation - All-Seeing Interactive an easy to use wrapper around cfnetwork http api, mac os x & iphone

Best substitute, successor or alternative for ASIHTTP for a download queue

I've recently read the news on that ASIHTTP is being discontinued. I have much respect for the makers of the library. However, I am now looking for a substitute that also supports queued download (multithreaded) on iOS, that also supports a progress bar with appropriate information.

Is there any (hopefully lightweight) library, that is in an active development livecycle? ARC support would also be much appreciated.

Many thanks for your thoughts.

Source: (StackOverflow)

AFNetworking : How to know if response is using cache or not ? 304 or 200

I can't find any answer to my question, may be I miss something...

When I ask for a url, I need to know if the response comes from the cache or from the net.

Is the status code 304 or 200 ? (but AFNetworking always responde 200)

With ASIHTTPRequest I used to check "didUseCachedResponse" from ASIHTTPRequest, this was perfect.

Source: (StackOverflow)

Objective-C: Instance Variable in Category

I am just asking whether it was possible to add an instance variable via a category. My special problem is, that I need to add an NSIndexPath property to an ASIHTTPRequest object but I don't wanna subclass the ASIHTTPRequest as a matter of principle.

Do I have any kind of alternative?

Thanks for your answers, Christian

Source: (StackOverflow)

ASIHTTPRequest set timeout

How can I set the session timeout using ASIHTTPRequest ?


Source: (StackOverflow)

Generic approach to NSManagedObjectContext in multi-threaded application

I've read a number of posts here about NSManagedObjectContext and multi-threaded applications. I've also gone over the CoreDataBooks example to understand how separate threads require their own NSManagedObjectContext, and how a save operation gets merged with the main NSManagedObjectContext. I found the example to be good, but also too application specific. I'm trying to generalize this, and wonder if my approach is sound.

My approach is to have a generic function for fetching the NSManagedObjectContext for the current thread. The function returns the NSManagedObjectContext for the main thread, but will create a new one (or fetch it from a cache) if called from within a different thread. That goes as follows:

+(NSManagedObjectContext *)managedObjectContext {
    MyAppDelegate *delegate = (MyAppDelegate *)[[UIApplication sharedApplication] delegate];
    NSManagedObjectContext *moc = delegate.managedObjectContext;

    NSThread *thread = [NSThread currentThread];

    if ([thread isMainThread]) {
        return moc;

    // a key to cache the context for the given thread
    NSString *threadKey = [NSString stringWithFormat:@"%p", thread];

    // delegate.managedObjectContexts is a mutable dictionary in the app delegate
    NSMutableDictionary *managedObjectContexts = delegate.managedObjectContexts;

    if ( [managedObjectContexts objectForKey:threadKey] == nil ) {
        // create a context for this thread
        NSManagedObjectContext *threadContext = [[[NSManagedObjectContext alloc] init] autorelease];
        [threadContext setPersistentStoreCoordinator:[moc persistentStoreCoordinator]];
        // cache the context for this thread
        [managedObjectContexts setObject:threadContext forKey:threadKey];

    return [managedObjectContexts objectForKey:threadKey];

Save operations are simple if called from the main thread. Save operations called from other threads require merging within the main thread. For that I have a generic commit function:

+(void)commit {
    // get the moc for this thread
    NSManagedObjectContext *moc = [self managedObjectContext];

    NSThread *thread = [NSThread currentThread];

    if ([thread isMainThread] == NO) {
        // only observe notifications other than the main thread
        [[NSNotificationCenter defaultCenter] addObserver:self

    NSError *error;
    if (![moc save:&error]) {
        // fail

    if ([thread isMainThread] == NO) {
        [[NSNotificationCenter defaultCenter] removeObserver:self 

In the contextDidSave: function we perform the merge, if called by the notification in commit.

+(void)contextDidSave:(NSNotification*)saveNotification {
    MyAppDelegate *delegate = (MyAppDelegate *)[[UIApplication sharedApplication] delegate];
    NSManagedObjectContext *moc = delegate.managedObjectContext;

    [moc performSelectorOnMainThread:@selector(mergeChangesFromContextDidSaveNotification:)

Finally, we clean-up the cache of NSManagedObjectContext with this:

+(void)initialize {
    [[NSNotificationCenter defaultCenter] addObserver:self 

+(void)threadExit {
    MyAppDelegate *delegate = (MyAppDelegate *)[[UIApplication sharedApplication] delegate];
    NSString *threadKey = [NSString stringWithFormat:@"%p", [NSThread currentThread]];  
    NSMutableDictionary *managedObjectContexts = delegate.managedObjectContexts;    

    [managedObjectContexts removeObjectForKey:threadKey];

This compiles and seems to work, but I know threading problems can be tricky due to race conditions. Does anybody see a problem with this approach?

Also, I'm using this from within the context of an asynchronous request (using ASIHTTPRequest), which fetches some data from a server and updates and inserts the store on the iPhone. It seems NSThreadWillExitNotification doesn't fire after the request completes, and the same thread is then used for subsequent requests. This means the same NSManagedObjectContext is used for separate requests on the same thread. Is this a problem?

Source: (StackOverflow)

How to accept self-signed certificate with asihttprequest

I am trying to get a self-signed certificate to work with my application.

I am using the ASIHTTPRequest library at the moment like so :

- (IBAction)sendHttpsRequest
    //Set request address
    NSMutableString *databaseURL = [[NSMutableString alloc] initWithString:@""];

    //call ASIHTTP delegates (Used to connect to database)
    NSURL *url = [NSURL URLWithString:databaseURL];

    //This sets up all other request
    ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];

    [request setDelegate:self];
    [request setValidatesSecureCertificate:YES];
    [request startAsynchronous];

I have set setValidatesSecureCertificate to YES in the hope that something would happen but obviously nothing has because I'm not sure what I have to do.

This is the error I'm getting in my log

2011-12-06 14:27:33.514 connectionTest[916:207] Error Domain=ASIHTTPRequestErrorDomain Code=1 "A connection failure occurred: SSL problem (Possible causes may include a bad/expired/self-signed certificate, clock set to wrong date)" UserInfo=0x683a860 {NSUnderlyingError=0x68390d0 "The operation couldn’t be completed. (OSStatus error -9807.)", NSLocalizedDescription=A connection failure occurred: SSL problem (Possible causes may include a bad/expired/self-signed certificate, clock set to wrong date)}

Any help would be greatly appreciated.

Source: (StackOverflow)

Incorrect NSStringEncoding value 0x0000 detected (using ASIHTTPRequest)

I'm using ASIHTTPRequst in my application and im having some problems, but only on certain devices. In some cases i get the following error:

" Incorrect NSStringEncoding value 0x0000 detected. Assuming NSASCIIStringEncoding. Will stop this compatiblity mapping behavior in the near future "

I got limited options for testing this out, because it works on all my internal test devices, but the problem still occurs on one or more of my clients test phones. It may also be a case when the phone is connected to the cellular network, as it seems to be working on wifi.

Does anyone know what might cause the problem? I see there are similar type of questions but my code looks like its correct both from the other questions answers and the ASIHTTPRequest site.

Edit When the error occurs no response from server is recieved so the user is stuck at register/login.


- (NSString *)urlEncodeValue:(NSString *)str
    NSString *result = (NSString *) CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)str, NULL, CFSTR(":/?#[]@!$&’()*+,;="), kCFStringEncodingUTF8);
    return [result autorelease];

ASIHTTPRequest code snippet:

    NSString *encodedUrlAdress = [NSString stringWithFormat:@"%@user/register/%@/%@/%@/%d/%@/%@/%@/%@", 
                                   [self urlEncodeValue:_firstName], 
                                   [self urlEncodeValue:_lastName], 
                                   [self urlEncodeValue:_phoneNumber], 
                                   [self urlEncodeValue:_birthDate], 
                                   [self urlEncodeValue:_address], 
                                   [self urlEncodeValue:_postalNumber]];    
    NSLog(@"encodedUrlAdress: %@", encodedUrlAdress);

    NSURL *url = [NSURL URLWithString:encodedUrlAdress];
    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
    [request startSynchronous];
    NSError *error = [request error];

    if (!error) {
// do stuff

Source: (StackOverflow)

What library to import for #import

I have imported ASIHTTP files into my project and inside ASIWebPageRequest.m there is the following import:

#import <libxml/HTMLparser.h>

which is not recognized. What library should I add in order to be recognized?

Source: (StackOverflow)

How? UITableViewCell with UIImageView asynchronously loaded via ASINetworkQueue

I'm trying to load some images in table cells asynchronously using ASINetworkQueue. I just can't figure it out and can't seem to find a good SIMPLE example.

The best I can find is this, but its just totally overkill and a little too complicated for me:

Does anyone else have any tips/solutions/code for doing this with the ASIHTTPRequest library?

Source: (StackOverflow)

Why are my ASIHTTPRequest files showing ARC errors?

I have implemented all of my ASIHTTPRequest files, but unfortunately the following errors occur:

enter image description here

enter image description here

Why is this happening?

Source: (StackOverflow)

What are alternatives to NSURLConnection for chunked transfer encoding

I've checked for other questions relevant to this, but the only answer is "Use ASIHTTPRequest" as this is no longer being developed I wanted to ask what alternatives people are using, whilst working on our SDK I came across a lot of strange behaviour in NSURLConnection when receiving data from the server.

We tracked it down to the fact that NSURLConnection doesn't deal well with responses in chunked-encoding. Or at least so we read in this question here NSURLConnection and "chunked" transfer-coding

Some developers we were talking to say it gets better in iOS 5, we need to make sure that our SDK is backwards compatible with iOS 4.3 at least.

I want to confirm this is infact an issue in NSURLConnection, and how people are dealing with it.

All the alternatives I've found so far are based off of NSURLConnection and I'm assuming as such will have the same flaw. ASIHTTPRequest did in fact work because it's based a little lower than NSURLConnection, but were looking for alternatives in the knowledge it's no longer supported.

A list of other libraries looked at are: Restkit, ShareKit, LRResty, AFNetworking, TTURLRequest

I'm aware there are similar questions here Is RESTKit a good replacement for ASIHTTPRequest? and here ASIHTTPRequest alternative But both of the solutions are based off NSURLConnection.

EDIT: I noticed I pointed to the wrong question at the start of my post, so thats updated. It points to a thread from 2008, and i've seen similar ones but none that are recent.

Source: (StackOverflow)

Objective C - HTTP/0.9 response from GET using ASIHTTPRequest

I've started using ASIHTTPRequest in my iOS project to execute REST server method calls and so far have been very successful with it. I just have one strange intermittent problem. Very occasionally I get the following response from using [ASIHTTPRequest startAsynchronous] :

HTTP/0.9 200 OK

When this occurs my server method doesn't get called. Normally every method call returns with a response starting 'HTTP/1.1'. I'm using HTTPS with a GeoTrust/RapidSSL certificate to secure the connection. Interestingly I've found that I get the same 'HTTP/0.9 200 OK' response if I try to connect to the SSL port (443) but specifying 'http' as the protocol.

Just to add more info - the problem mostly occurs after the app has been left idle for a period of time. E.g. request completes successfully, then leave app idle for a while, then on the next request the problem occurs then app continues to work fine.

Can anybody shed some light on what might be occurring?

Many thanks, Jonathan

UPDATE : I've pasted below some debug information output by ASIHTTPRequest when the problem occurred :

2012-07-12 09:35:49.376 mytestapp[3038:18f07] [CONNECTION] Closing connection #13 because it has expired
2012-07-12 09:35:49.377 mytestapp[3038:18f07] [CONNECTION] Closing connection #14 because it has expired
2012-07-12 09:35:49.378 mytestapp[3038:18f07] [CONNECTION] Closing connection #15 because it has expired
2012-07-12 09:35:49.380 mytestapp[3038:18f07] [CONNECTION] Request #39 will use connection #16
2012-07-12 09:35:49.381 mytestapp[3038:18f07] [CONNECTION] Request #40 will use connection #17
2012-07-12 09:35:49.382 mytestapp[3038:18f07] [CONNECTION] Request #41 will use connection #18
2012-07-12 09:35:49.529 mytestapp[3038:18f07] [STATUS] Request <ASIHTTPRequest: 0x88a1e00> finished downloading data (0 bytes)
2012-07-12 09:35:49.529 mytestapp[3038:18f07] [STATUS] Request <ASIHTTPRequest: 0x88a1e00> received response headers
2012-07-12 09:35:49.530 mytestapp[3038:18f07] [AUTH] Request <ASIHTTPRequest: 0x88a1e00> has passed Basic authentication
2012-07-12 09:35:49.530 mytestapp[3038:18f07] [CONNECTION] Got no keep-alive header, will keep this connection open for 60.000000 seconds
2012-07-12 09:35:49.530 mytestapp[3038:18f07] [CONNECTION] Request #41 finished using connection #18
2012-07-12 09:35:49.531 mytestapp[3038:18f07] [STATUS] Request finished: <ASIHTTPRequest: 0x88a1e00>
2012-07-12 09:35:49.531 mytestapp[3038:15803] responseHeaders={
2012-07-12 09:35:49.531 mytestapp[3038:18f07] [STATUS] Request cancelled: <ASIHTTPRequest: 0x88a1e00>
2012-07-12 09:35:49.532 mytestapp[3038:18f07] [STATUS] Request cancelled: <ASIHTTPRequest: 0x88a0200>
2012-07-12 09:35:49.532 mytestapp[3038:18f07] [STATUS] Request <ASIHTTPRequest: 0x88a0200>: Cancelled
2012-07-12 09:35:49.532 mytestapp[3038:18f07] [CONNECTION] Request #39 failed and will invalidate connection #16
2012-07-12 09:35:49.533 mytestapp[3038:18f07] [STATUS] Request cancelled: <ASIHTTPRequest: 0x88a0a00>
2012-07-12 09:35:49.533 mytestapp[3038:18f07] [STATUS] Request <ASIHTTPRequest: 0x88a0a00>: Cancelled
2012-07-12 09:35:49.533 mytestapp[3038:18f07] [CONNECTION] Request #40 failed and will invalidate connection #17

Source: (StackOverflow)

iOS 5 : https ( ASIHTTPRequest) stop working

I got an app which use ASIHTTPRequest.

I recompiled my app with iOS 5 (sdk : 5.0 / xcode: 4.2 Build 4D199 ) and the https connections fail with error message (the same call with https disabled works fine):

Error Domain=ASIHTTPRequestErrorDomain Code=1 "A connection failure occurred" UserInfo=0xa8e66e0 {NSUnderlyingError=0xa8ac6c0 "The operation couldn’t be completed. (OSStatus error -9844.)", NSLocalizedDescription=A connection failure occurred}

With debug log enabled:

[STATUS] Starting asynchronous request <ASIFormDataRequest: 0xd96fc00>

[CONNECTION] Request <ASIFormDataRequest: 0xd96fc00> will not use a persistent connection

[STATUS] Request <ASIFormDataRequest: 0xd96fc00>: Failed

[CONNECTION] Request #(null) failed and will invalidate connection #(null)

I found this related post: which could explain my problem.

based on the idea that iOS 5 prefer TLS 1.2, I try changing the setting kCFStreamSocketSecurityLevelTLSv1 in AIHTTPRequest.m                    

  NSDictionary *sslProperties = [[NSDictionary alloc] initWithObjectsAndKeys:
                                     [NSNumber numberWithBool:YES],
                                     [NSNumber numberWithBool:YES], kCFStreamSSLAllowsAnyRoot,
                                     [NSNumber numberWithBool:NO],  kCFStreamSSLValidatesCertificateChain,
                                      kCFStreamSocketSecurityLevelTLSv1, kCFStreamSSLLevel,// my modif

with no success. Maybe my modification is incorrect?


  • I got the ARC disabled
  • I use libz.1.2.5.dylib
  • I updated the ASIHTTPRequest a week ago.

I do not know if the issue is a certificate story (like TLS version) or something else.

any help/idea is welcome !

Source: (StackOverflow)

Apple Mach-O Linker (id) Error - undefined symbols for architecture i386

I know this type of error has been raised many times before, but I have not found solution of my error. I am using xcode 4.0. I downloaded ASIHTTPRequest zip and copied classes folder along with two files of 'Reachability". After compilation, it is giving me strange errors which I can't figure out. Below I copied text of error for undefined symbols for architecture i386.

Ld /Users/svp/Library/Developer/Xcode/DerivedData/Manual_BeforePres2-fahkeiivemkgpubswgvzglvndszw/Build/Products/Debug-iphonesimulator/ normal i386
cd "/Users/svp/Desktop/Manual nav before pres 2"
setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/llvm-gcc-4.2 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.3.sdk -L/Users/svp/Library/Developer/Xcode/DerivedData/Manual_BeforePres2-fahkeiivemkgpubswgvzglvndszw/Build/Products/Debug-iphonesimulator -F/Users/svp/Library/Developer/Xcode/DerivedData/Manual_BeforePres2-fahkeiivemkgpubswgvzglvndszw/Build/Products/Debug-iphonesimulator -filelist /Users/svp/Library/Developer/Xcode/DerivedData/Manual_BeforePres2-fahkeiivemkgpubswgvzglvndszw/Build/Intermediates/ -mmacosx-version-min=10.6 -Xlinker -objc_abi_version -Xlinker 2 -lz -framework SystemConfiguration -framework CFNetwork -framework UIKit -framework Foundation -framework CoreGraphics -o /Users/svp/Library/Developer/Xcode/DerivedData/Manual_BeforePres2-fahkeiivemkgpubswgvzglvndszw/Build/Products/Debug-iphonesimulator/

 Undefined symbols for architecture i386:
"_UTTypeCreatePreferredIdentifierForTag", referenced from:
  +[ASIHTTPRequest mimeTypeForFileAtPath:] in ASIHTTPRequest.o
"_UTTypeCopyPreferredTagWithClass", referenced from:
  +[ASIHTTPRequest mimeTypeForFileAtPath:] in ASIHTTPRequest.o
"_kUTTagClassFilenameExtension", referenced from:
  +[ASIHTTPRequest mimeTypeForFileAtPath:] in ASIHTTPRequest.o
"_kUTTagClassMIMEType", referenced from:
  +[ASIHTTPRequest mimeTypeForFileAtPath:] in ASIHTTPRequest.o
ld: symbol(s) not found for architecture i386

collect2: ld returned 1 exit status

Also it is giving me a warning in ASIAuthenticationDialog.m file:

ASIAuthenticationDialog may not respond to _presentingViewController

Please anyone tell me what are these errors and warning for? What am I doing wrong? I have wasted many hours over it :(


Code for warning in ASIAuthenticationDialog.m file:

#import "ASIAuthenticationDialog.h"
#import "ASIHTTPRequest.h"

#pragma mark show / dismiss

+ (void)dismiss
if ([sharedDialog respondsToSelector:@selector(presentingViewController)])
    [[sharedDialog presentingViewController] dismissModalViewControllerAnimated:YES];
    [[sharedDialog parentViewController] dismissModalViewControllerAnimated:YES];

Source: (StackOverflow)

AFNetworking - Download multiple files + monitoring via UIProgressView

I am trying to change my code from ASIHTTPRequest to AFNetworking. Currently I want to select 10-15 different HTTP URLs (files) and download them to a documents folder.

With ASIHTTPRequest that was pretty easy with

[myQueue setDownloadProgressDelegate:myUIProgressView];

In AFNetworking I can't figure out how to do it. I have the following code which downloads the files, stores them and notifies when a file downloads successfully, but I can't create the progress bar for this queue with total size.

for (i=0; i<3; i++) {

    NSString *urlpath = [NSString stringWithFormat:@""];
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlpath]];

    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *path = [[paths objectAtIndex:0] stringByAppendingPathComponent:[NSString stringWithFormat:@"",i]];
    operation.outputStream = [NSOutputStream outputStreamToFileAtPath:path append:NO];

    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
        NSLog(@"Successfully downloaded file to %@", path);
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"Error: %@", error);

    [operation setDownloadProgressBlock:^(NSInteger bytesWritten, NSInteger totalBytesWritten, NSInteger totalBytesExpectedToWrite) {
        NSLog(@"Sent %d of %d bytes, %@", totalBytesWritten, totalBytesExpectedToWrite, path);

    [myQueue addOperation:operation];  

Source: (StackOverflow)