My codes below is used to access the amazon s3 to get a .zip file .
and my request url is like this:
`http://xxx.s3.amazonaws.com/Pack1A.zip?AWSAccessKeyId=AKIAIEMQY4BEQUOCUP7Q&Expires=1298945115&Signature=sxoXZ4y7osXjn
IycQynGbE9%2Bb5E%3D`

Code Snippet:

```
time_t rawtime;
time(&rawtime); 

gHttpDownloader->SetRequestHeader("Authorization","AWS AKIAIEMQY4BEQUOCUP7Q:aN6bjwDkeZXIHDrqk3MHlj4shl0%3D");
gHttpDownloader->SetRequestHeader("Authorization", buf);
gHttpDownloader->SetRequestHeader("Cache-Control", "max-age=0");
gHttpDownloader->SetRequestHeader("Accept","application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*;q=0.5");
gHttpDownloader->SetRequestHeader("Accept-Encoding", "gzip,deflate,sdch");
gHttpDownloader->SetRequestHeader("Accept-Language", "en-GB");
gHttpDownloader->SetRequestHeader("Accept-Charset", "ISO-8859-1,utf-8;q=0.7,*;q=0.3");
gHttpDownloader->Post(gURL, NULL,0,GotHeaders, NULL);

............ //GotHeaders is a callback function that reads input from the response.

```

It always prints the error of 403 forbidden. Can someone tell me why?