Objective-C

curl with Variable Substitution in the Request Body

See more CURL Examples

This example demonstrates using variables located in the request body with the {{variable_name}} syntax. Objective-C

#import <CkoStringBuilder.h>
#import <CkoHttpCurl.h>

BOOL success = NO;

//  Variables can also be used within the HTTP request body.
//  Variable names are enclosed between {{ and }}

//  Here is a curl command with two variables {{name}} and {{age}} located in the data.

//  curl -X POST https://api.example.com/data \
//    -H "Content-Type: application/json" \
//    -d '{"name":"{{name}}","age":{{age}}}'

CkoStringBuilder *sbCurl = [[CkoStringBuilder alloc] init];
[sbCurl AppendLn: @"curl -X POST https://api.example.com/data \\"];
[sbCurl AppendLn: @"  -H \"Content-Type: application/json\" \\"];
[sbCurl AppendLn: @"  -d '{\"name\":\"{{name}}\",\"age\":{{age}}}'"];

CkoHttpCurl *curl = [[CkoHttpCurl alloc] init];

//  Provide values for variables.
[curl SetVar: @"name" varValue: @"Alice"];
[curl SetVar: @"age" varValue: @"30"];

//  To demonstrate how the variables are replaced, this example does not execute the curl command. 
//  Instead, it generates the raw HTTP request that would be sent if the curl command were run.
CkoStringBuilder *sbRawRequest = [[CkoStringBuilder alloc] init];
success = [curl ToRawRequest: [sbCurl GetAsString] sb: sbRawRequest];
if (success == NO) {
    NSLog(@"%@",curl.LastErrorText);
    return;
}

NSLog(@"%@",[sbRawRequest GetAsString]);

//  Output:

//  POST /data HTTP/1.1
//  Host: api.example.com
//  Content-Type: application/json
//  Content-Length: 25
//  
//  {"name":"Alice","age":30}

//  --------------------------------------------------------------------------------------------------
//  Note: Variable substitution in the request body can be turned off by 
//  setting the EnableBodyVars property equal to false

curl.EnableBodyVars = NO;

success = [curl ToRawRequest: [sbCurl GetAsString] sb: sbRawRequest];
if (success == NO) {
    NSLog(@"%@",curl.LastErrorText);
    return;
}

NSLog(@"%@",[sbRawRequest GetAsString]);

//  The raw request with body variable substitution disable:

//  Host: api.example.com
//  Content-Type: application/json
//  Content-Length: 33
//  
//  {"name":"{{name}}","age":{{age}}}