Objective-C

Send a Staged Multipart REST Request

Demonstrates Rest.SendReqMultipart, which sends a multipart request using the parts configured on the object, then reads the response in separate steps.

Background. The staged request model separates sending from reading: a SendReq method transmits the request, ReadResponseHeader reads the status line and headers, and a ReadResp method reads the body. This gives fine control over large or streamed messages compared with the single-call full-request methods.

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Objective-C

#import <CkoRest.h>
#import <NSString.h>

BOOL success = NO;

CkoRest *rest = [[CkoRest alloc] init];
BOOL bTls = YES;
BOOL bAutoReconnect = YES;
success = [rest Connect: @"example.com" port: [NSNumber numberWithInt: 443] tls: bTls autoReconnect: bAutoReconnect];
if (success == NO) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

//  Configure one multipart part before sending.
rest.PartSelector = @"1";
[rest AddHeader: @"Content-Type" value: @"text/plain"];
[rest AddHeader: @"Content-Disposition" value: @"form-data; name=\"field1\""];
success = [rest SetMultipartBodyString: @"value1"];
if (success == NO) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

//  Send the multipart request using the configured parts.
success = [rest SendReqMultipart: @"POST" uriPath: @"/api/upload"];
if (success == NO) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

//  After sending, read the response status line and header fields.  The return value is the HTTP
//  status code, or -1 if no response was received.
int statusCode = [[rest ReadResponseHeader] intValue];
if (statusCode < 0) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Response status code: ",statusCode);

//  Read the response body as text.
NSString *responseBody = [rest ReadRespBodyString];
if (rest.LastMethodSuccess == NO) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

NSLog(@"%@",responseBody);