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http.Fetch( string url, function onSuccess = nil, function onFailure = nil, table headers = {} )


Launches an asynchronous GET request to a HTTP server.

HTTP requests returning a status code >= 400 are still considered a success and will call the onSuccess callback.

The onFailure callback is usually only called on DNS or TCP errors (e.g. the website is unavailable or the domain does not exist).

HTTP-requests to destinations on private networks (such as won't work.
To enable HTTP-requests to destinations on private networks use Command Line Parameters -allowlocalhttp.


1 string url
The URL of the website to fetch.
2 function onSuccess = nil
Function to be called on success. Arguments are

3 function onFailure = nil
Function to be called on failure. Arguments are

  • string error - The error message.
4 table headers = {}
KeyValue table for headers.


Shows the typical usage to get the HTML of a webpage.

local theReturnedHTML = "" -- Blankness http.Fetch( "", -- onSuccess function function( body, length, headers, code ) -- The first argument is the HTML we asked for. theReturnedHTML = body end, -- onFailure function function( message ) -- We failed. =( print( message ) end, -- header example { ["accept-encoding"] = "gzip, deflate", ["accept-language"] = "fr" } )
Output: If it successfully fetched the page, the variable theReturnedHTML should contain the returned HTML in plain text.

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