HTSQL shell's Get Request Not compatible with Gunicorn+Nginx for long queries

Question

I am using HTSQL with Django. I use HTSQL shell to check/generate my queries and then use them for rendering data in json and raw formats. so like, my HTSQL shell url is:

http://127.0.0.1:8000/htsql

so when I want to access data from a table in the HTSQL shell environment, I do,

http://127.0.0.1:8000/htsql/table_name

and to get JSON data,

http://127.0.0.1:8000/htsql/table_name/:json

In background, HTSQL shell fetches this data by using a GET request. So from my client-side Javascipt/jQuery, I initiate a GET request with its URL in above format and get my desired JSON data directly.

Everything was fine when I was using local Django server, but when I deployed my project using Gunicorn and Nginx, it naturally started to block some of my long(actually, pretty long) queries in the GET requests. I searched this problem and found out that Gunicorn allows GET request values ranging from 0 to 8190 characters. So I tweaked my Gunicorn settings for the maximum limit but still the same problem. This was because my queries, when used with several filter values, are exceeding 8190 limit.

So I thought to use POST request as its normally preferred for secure and long requests. So I changed my GET request to POST request and pointed it to the same URL as mentioned above and tried it on my local Django Server(i.e without Gunicorn and Nginx). But now I get "400 BAD REQUEST". With firebug, I checked that the response was "POST requests are not permitted."

I also noticed that the HTSQL_Django Module routes all the request to htsql_django.views.gateway. I had a look to this gateway function in the views.py of htsql_django module but couldn't find any clue.

Is it so, that the HTSQL doesn't accepts POST requests?? How can I fetch/access JSON data from HTSQL using POST request?