LrHttp.postMultipart not reaching web service or not giving any response

I need to send the image file using multipart request from Lightroom to my local web service using Lua language.

I have tested using sending headers also but not working...

I have created a function called as uploadUsingMultipart ():

Calling this uploadUsingMultipartfunction from:

function exportServiceProvider.processRenderedPhotos(functionContext, exportContext)

-- Make a local reference to the export parameters.
local exportSession = exportContext.exportSession
local exportParams = assert(exportContext.propertyTable)

-- Set progress title.
local nPhotos = exportSession:countRenditions()

-- get server
-- serverId = exportParams.serverValue
-- server = prefs.serverTable[serverId].server

-- get album
-- local albumName = exportParams.albumValue
-- outputToLog("album name==" .. albumName)

local progressScope = exportContext:configureProgress {
title = nPhotos > 1
and LOC("$$$/GalleryUpload/Upload/Progress=Uploading ^1 photos to the Gallery", nPhotos)
or LOC "$$$/GalleryUpload/Upload/Progress/_One_=Uploading one photo to the Gallery",
}

-- Iterate through photo renditions.
local failures = {}
local photos_added = {}

for i, rendition in exportContext:renditions { stopIfCanceled = true } do

-- update the progress information

progressScope:setPortionComplete((i - 1) / nPhotos)

-- Get next photo.
local photo = rendition.photo

if not rendition.wasSkipped then

local success, pathOrMessage = rendition:waitForRender()

-- Check for cancellation again after photo has been rendered.
if progressScope:isCanceled() then
break
end
if success then

local filename = LrPathUtils.leafName(pathOrMessage)

exportServiceProvider.uploadUsingMultipart(pathOrMessage)

-- When done with photo, delete temp file. There is a cleanup step that happens later,
-- but this will help manage space in the event of a large upload.
LrFileUtils.delete(pathOrMessage)
end
end
end


end

functionuploadUsingMultipart(filepath)--created inside LrTaskslocal url ="http://localhosturl" local mycontent ={{
 name ="lightroom_message",
 value ="sent from lightroom plugin multiparta"},{
 name ='file',
 filePath = filepath,
 fileName = LrPathUtils.leafName(filepath),contentType = 'multipart/form-data'}}local response, headers = LrHttp.postM
ultipart(url, mycontent)

end

But my web service is not getting called properly and I am using LrHttp.postMultipart() method to do so..

If I am sending just this param to web service (then working fine):

{
 name ="lightroom_message",
 value ="sent from lightroom plugin multiparta"}

but when I include my file payload then its not working using pure Lua implementation.