Fix already built payload thrown error

[chamil321]

Purpose

Related to ballerina-platform/ballerina-library#1600

Examples

Checklist

• Linked to an issue
• Updated the changelog
• Added tests

[codecov]

Codecov Report

Merging #511 (3153013) into v1.1.0-alpha8-SNAPSHOT (99931e5) will increase coverage by 0.02%.
The diff coverage is 87.50%.

@@                     Coverage Diff                      @@
##             v1.1.0-alpha8-SNAPSHOT     #511      +/-   ##
============================================================
+ Coverage                     58.29%   58.32%   +0.02%     
  Complexity                     2486     2486              
============================================================
  Files                           371      371              
  Lines                         18529    18531       +2     
  Branches                       3956     3957       +1     
============================================================
+ Hits                          10802    10808       +6     
+ Misses                         7077     7072       -5     
- Partials                        650      651       +1     

Impacted Files	Coverage Δ
...t/http/nativeimpl/ExternHttpDataSourceBuilder.java	83.18% <87.50%> (+0.30%)	⬆️
...ransport/message/DefaultFullHttpMessageFuture.java	60.00% <0.00%> (-4.00%)	⬇️
...ballerinalang/net/http/signature/ParamHandler.java	85.29% <0.00%> (-1.48%)	⬇️
...actimpl/sender/channel/pool/ConnectionManager.java	83.03% <0.00%> (-0.90%)	⬇️
http-ballerina/http_response.bal	81.46% <0.00%> (+0.86%)	⬆️
...ctimpl/sender/http2/Http2ClientTimeoutHandler.java	63.30% <0.00%> (+0.91%)	⬆️
.../contractimpl/sender/http2/Http2TargetHandler.java	64.61% <0.00%> (+3.07%)	⬆️
...ractimpl/listener/UriAndHeaderLengthValidator.java	90.00% <0.00%> (+5.00%)	⬆️

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