Looks like header length is a restriction on the server side.  See


So there may not be a way around it from the client.


On 2/1/18, 9:12 PM, "Deepak MS" <megharajdee...@gmail.com> wrote:

>I am using HttpService and making a post request by passing custom header,
>instead of query string (as IE doesn't allow longer query strings).
>However, flex is not at all invoking the service call in case of header
>length being greater than 8192 characters long. I get "Error 2145:
>Cumulative length of requestHeaders must be less than 8192 characters".
>Kindly let me know if there is a way to remove this restriction. If not,
>how can I make a server call with long parameter value?
> - Deepak

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