HTTP::respond and header request modifications

Little about the environment. Its a VE setup on my local machine in ESX for development purposes. The initial request to the BigIP with the creds for the local S3 storage is as follows (just a sample from the logs today):

May 30 03:17:31 bigip01 info tmm[1929]: Rule /Common/syncp-plugin/syncp-irule : GET /testbucket1/shot.png HTTP/1.1  User-Agent: aws-sdk-nodejs/2.229.1 darwin/v8.7.0 callback  X-Amz-Content-Sha256: e3b0c44298fc1c149afbf4c89AABBCCDDEEFFGGHHIIJJKKLLMMNNOOPP  Content-Length: 0  Host: 10.128.10.240  X-Amz-Date: 20180530T031731Z  Authorization: AWS4-HMAC-SHA256 Credential=1316923@ecstd.emc.local/20180530/us-west-1/s3/aws4_request, SignedHeaders=host;x-amz-content-sha256;x-amz-date, Signature=3cd6b5f4159cff60c601c2491722096d68a7aec5390bf663291bb0997fc6a1dc  Connection: close

Return values printed as requested via iRules. I am returning these in a list from iRulesLX:

set host [ lindex $result 0 ]
set xamzcontentsha256 [ lindex $result 1 ]
set xamzdate [ lindex $result 2 ]
set authorization [ lindex $result 3 ]

log local0. "HOST: $host"
log local0. "X-Amz-Content-Sha256: $xamzcontentsha256"
log local0. "X-Amz-Date: $xamzdate"
log local0. "Authorization: $authorization"

May 31 00:14:21 bigip01 info tmm[1929]: Rule /Common/syncp-plugin/syncp-irule : HOST: s3.amazonaws.com
May 31 00:14:21 bigip01 info tmm[1929]: Rule /Common/syncp-plugin/syncp-irule : X-Amz-Content-Sha256: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
May 31 00:14:21 bigip01 info tmm[1929]: Rule /Common/syncp-plugin/syncp-irule : X-Amz-Date: 20180531T001421Z
May 31 00:14:21 bigip01 info tmm[1929]: Rule /Common/syncp-plugin/syncp-irule : Authorization: AWS4-HMAC-SHA256 Credential=n9pzu5kt6nggeneric/20180531/us-east-1/s3/aws4_request, SignedHeaders=host;x-amz-content-sha256;x-amz-date, Signature=3a0ad3e459c338b362a5e7dec941319f9d207d725b7fbcedcdf88efad059b9ef