Requirements

MobileCoreServices.framework

Components

APSHTTPRequest - Responsible for the http request
NSObject<APSHTTPRequestDelegate> - Responsible for the APSHTTPRequest callbacks
APSHTTPPostForm - Used to build a post form
APSHTTPResponse - Holds all the response information from the request
APSHTTPHelper - Helper class with some handy functions

GET Request:

// in header
#import <APSHTTPClient/APSHTTPClient.h>

-(void)sendRequest
{
    APSHTTPRequest *request = [[[APSHTTPRequest alloc] init] autorelease];
    [request setDelegate:self];
    [request setMethod: @"GET"];
    [request setUrl:[NSURL URLWithString: @"http://google.com/"]];
    [request send];
}

-(void)tiRequest:(APSHTTPRequest *)request onLoad:(APSHTTPResponse *)response
{
    NSString* response = [response responseString];
}

-(void)tiRequest:(APSHTTPRequest *)request onError:(APSHTTPResponse *)response
{
    NSString* errorMessage = [[response error] localizedDescription];
}

POST Request:

// in header
#import <APSHTTPClient/APSHTTPClient.h>

-(void)sendRequest
{
    APSHTTPPostForm *form = [[[APSHTTPPostForm alloc] init] autorelease];
    [form addFormKey:@"first_name" andValue: @"John"];
    [form addFormKey:@"last_name" andValue: @"Smith"];
    [form addFormData: UIImageJPEGRepresentation([[self myImageView] image], 0.7)
             fileName:@"image.jpeg"
            fieldName:@"photo"];

    APSHTTPRequest *request = [[[APSHTTPRequest alloc] init] autorelease];
    [request setDelegate:self];
    [request setMethod: @"POST"];
    [request setPostForm:form];
    [request setUrl:[NSURL URLWithString: @"http://some_server.com/api/post"]];
    [request send];
}

-(void)tiRequest:(APSHTTPRequest *)request onLoad:(APSHTTPResponse *)response
{
    NSString* response = [response responseString];
}

-(void)tiRequest:(APSHTTPRequest *)request onError:(APSHTTPResponse *)response
{
    NSString* errorMessage = [[response error] localizedDescription];
}