Problem :  

The header map variable (passed to getURL & postURL functions) will not permit the inclusion of an "Authorization" key/value pair. 

DS function to HTTP resource : 

1. map test.passingHeader()
2. {
3.     url = "http://webpdi.com/info.php";
4.     header = { 
5.               "Authorization" : "Basic dXNlcm5hbWU6cGFzc3dvcmQ=", 
6.               "header1" : "passed header1!",
7.               "header2" : "passed header2!", 
8.               "_Authorization" : "So I can pass \"_Authorization\" but not Authorization?" 
9.             };
10. 
    
    
11.     response = getUrl(url, header,false);
12.     info header;
13. 
    
    
14. 
    
    
15.     /*RESPONSE LOOKS LIKE THIS
16. 
    
    
17.        {responseCode=200, responseText=
18.            Array (
19.             [Host] => webpdi.com
20.             [Connection] => Keep-Alive, TE
21.             [TE] => trailers, deflate, gzip, compress
22.             [User-Agent] => RPT-HTTPClient/0.3-3E
23.             [_Authorization] => So I can pass "_Authorization" but not Authorization?
24.             [header2] => passed header2!
25.             [header1] => passed header1!
26.             [Accept-Encoding] => deflate, gzip, x-gzip, compress, x-compress
27.           )
28.        }
29. 
    
    
30.     */    
31. 
    
    
32.     return response;
33. }

HTTP resource code (yeah, that's all) : 

1. <?php
2. print_r(apache_request_headers());
3. ?>

Hurl.it test showing the correct response. 

Run HTTP call using Hurl.it