title: Error in parse_aws_s3_response, Forbidden (http 403)
body: <p>I a
  I'm trying to use aws.s3 library to load data into S3. Below is my code below:</p>
  
  <pre><code>Sys.setenv("AWS_ACCESS_KEY_ID" = ".............",
         "AWS_SECRET_ACCESS_KEY" = "...............",
         "AWS_DEFAULT_REGION" = "......") 
  </code></pre>
  
  <p>view bucket:</p>
  
  <pre><code>get_bucket(bucket = "....",
             check_region = FALSE,
             verbose = TRUE)
  </code></pre>
  
  <p>The code above works and contents of the bucket is returned. </p>
  
  <p>save object to s3:</p>
  
  <pre><code>s3save(data, 
         object = ".....",
         bucket = ".....")
  </code></pre>
  
  <p>Error return:</p>
  
  <pre><code>List of 4
  $ Code     : chr "AccessDenied"
  $ Message  : chr "Access Denied"
  $ RequestId: chr ""
  $ HostId   : chr ""
  - attr(*, "headers")=List of 6
  ..$ x-amz-request-id : chr ""
  ..$ x-amz-id-2       : chr ""
  ..$ content-type     : chr "application/xml"
  ..$ transfer-encoding: chr "chunked"
  ..$ date             : chr "Tue, 05 Sep 2017 13:23:42 GMT"
  ..$ server           : chr "AmazonS3"
  ..- attr(*, "class")= chr [1:2] "insensitive" "list"
  - attr(*, "class")= chr "aws_error"
  - attr(*, "request_canonical")= chr "GET\n/"| __truncated__
  - attr(*, "request_string_to_sign")= car ""| __truncated__
  - attr(*, "request_signature")= chr "AWS4-HMAC-SHA256 Credential=| 
  __truncated__
  NULL
  
  Error in parse_aws_s3_response(r, Sig, verbose = verbose) : 
  Forbidden (HTTP 403).
  </code></pre>
  
  <p>Any solution to this problem.</p>