Need help with URL re-write without a redirect

I have virtual server on F5 with an iRule and want to add a condition for a new re-write. I have to re-write complete URL without redirecting or changing the URL in client's browser. Tested the below but client browsers keeps getting a reset. Below is my existing iRule and the syntax i have tried for re-write. Also attached few logs which show that traffic is matching the condition and re-writing the URL but fails.

Browser URL: "abc.domain.com/uri/path"

Backend URL: "abc4.domain4.com/file.html"   

when HTTP_REQUEST {
set doStream 0
switch [HTTP::host] {
"abc.domain.com" {
if {[HTTP::path] contains "/abc/abc" && [HTTP::query] contains "location="} {
HTTP::respond 301 "Location" "https://[HTTP::host]/abc/[string tolower [findstr [HTTP::query] "location=" 9]]"
pool xyz_pool
} elseif {[string tolower [HTTP::host]] starts_with "abc.domain.com" && [HTTP::path] eq "/uri/path"}
{ HTTP::header replace Host "abc4.domain4.com"
HTTP::uri "/file.html"
set doStream 4
log local0. "[HTTP::host][HTTP::uri] Changed rewrite"
pool test-pool
} elseif {[class match [HTTP::path] equals "url_redirect_list"]} {
set newURL [class match -value -- [HTTP::uri] equals "url_redirect_list"]
log local0. "NEW Redirect URI is [HTTP::uri]"
HTTP::respond 301 "Location" $newURL
} elseif {[class match [HTTP::path] equals "url_explicit_list"]} {
log local0. "[HTTP::path]: Explicit URL path goes to [LB::server] with cookie value [HTTP::cookie value "cookie"]"
HTTP::header replace Host "abc1.domain.com"
set doStream 1
log local0. "[IP::client_addr]:[TCP::client_port]: [LB::server] Request with persistence cookie [HTTP::cookie value "cookie"] to [HTTP::uri]"
pool explicit_pool
} elseif {[class match [HTTP::path] starts_with "url_wildcard_list"]} {
log local0. "[HTTP::path]: Wildcard URL path goes to [LB::server]"
HTTP::header replace Host "abc1.domain.com"
set doStream 1
#log local0. "[HTTP::path]: Wildcard URL path goes to [LB::server]"
}
elseif { [string tolower [HTTP::uri]] ne "/autodiscover" } {
log local0. "[IP::client_addr]:[TCP::client_port]: [LB::server] Request with persistence cookie [HTTP::cookie value "cookie"] to [HTTP::uri]"
pool backend_pool
persist cookie insert "cookie"
} else {
drop
}
}
}
}

when HTTP_RESPONSE {
switch $doStream {
0 {
return
}
1 {
STREAM::expression {@http://abc1.domain.com@https://abc.domain.com@}
STREAM::enable
}
4 {
STREAM::expression {@https://abc4.domain4.com/file.html@https://abc.domain.com/uri/path@}
STREAM::enable
}
}
}

/var/log/ltm.1:Apr 14 13:44:55 info tmm1[17567]: Rule /Common/POOL_SELECTION_IRULE <HTTP_REQUEST>: abc4.domain4.com/file.html Changed rewrite
/var/log/ltm.1:Apr 14 13:44:55 info tmm[17567]: Rule /Common/POOL_SELECTION_IRULE <HTTP_REQUEST>: abc4.domain4.com/file.html Changed rewrite
/var/log/ltm.1:Apr 14 13:45:04 info tmm[17567]: Rule /Common/POOL_SELECTION_IRULE <HTTP_REQUEST>: abc4.domain4.com/file.html Changed rewrite
/var/log/ltm.1:Apr 14 13:45:05 info tmm1[17567]: Rule /Common/POOL_SELECTION_IRULE <HTTP_REQUEST>: abc4.domain4.com/file.html Changed rewrite
/var/log/ltm.1:Apr 14 13:45:05 info tmm[17567]: Rule /Common/POOL_SELECTION_IRULE <HTTP_REQUEST>: abc4.domain4.com/file.html Changed rewrite
/var/log/ltm.1:Apr 14 13:50:05 info tmm[17567]: Rule /Common/POOL_SELECTION_IRULE <HTTP_REQUEST>: abc4.domain4.com/file.html Changed rewrite
/var/log/ltm.1:Apr 14 14:00:06 info tmm[17567]: Rule /Common/POOL_SELECTION_IRULE <HTTP_REQUEST>: abc4.domain4.com/file.html Changed rewrite
/var/log/ltm.1:Apr 14 15:42:37 info tmm1[17567]: Rule /Common/POOL_SELECTION_IRULE <HTTP_REQUEST>: abc4.domain4.com/file.html Changed rewrite

Any help is appreciated. 

Thanks