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Why I cannot load json data use data-url?

See original GitHub issue

Description
I want to use bootstrap-table in a Pug template and load a json file on the server.

I put the table in a bootstrap modal. the code is like:

link(rel='stylesheet', href='https://cdn.jsdelivr.net/npm/bootstrap@4.5.0/dist/css/bootstrap.min.css', integrity='sha384-9aIt2nRpC12Uk9gS9baDl411NQApFmC26EwAOH8WgZl5MYYxFfc+NcPb1dKGj7Sk', crossorigin='anonymous')
link(href='https://unpkg.com/bootstrap-table@1.18.0/dist/bootstrap-table.min.css', rel='stylesheet')

button.btn.btn-primary.btn-lg.btn-block(type='button', data-toggle='modal', data-target='#priceTable')
        | Preview Data
      #priceTable.modal.fade(tabindex='-1', role='dialog')
        .modal-dialog(role='document')
          .modal-content
            .modal-header
              h5.modal-title Preview
              button.close(type='button', data-dismiss='modal', aria-label='Close')
                span(aria-hidden='true') &times;
            .modal-body
              table#table(data-toggle='table', data-height='299', data-url=json_path)
                thead
                  tr
                    th(data-field="index") Size
                    th(data-field="goat") Goat
                    th(data-field="stockX") StockX
            .modal-footer
              button.btn.btn-secondary(type='button', data-dismiss='modal') Close
              a.btn.btn-success(download=file_name href=file_path) Download
      script.
        var $table = $('#table')
        $(function() {
          $('#modalTable').on('shown.bs.modal', function () {
            $table.bootstrapTable('resetView')
          })
        })
script(src='https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js', integrity='sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj', crossorigin='anonymous')
script(src='https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js', integrity='sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo', crossorigin='anonymous')
script(src='https://cdn.jsdelivr.net/npm/bootstrap@4.5.0/dist/js/bootstrap.min.js', integrity='sha384-OgVRvuATP1z7JjHLkuOU7Xw704+h835Lr+6QL9UvYjZE3Ipu6Tp75j7Bh/kR0JKI', crossorigin='anonymous')
script(src='https://unpkg.com/bootstrap-table@1.18.0/dist/bootstrap-table.min.js')

The json file is like:

[
    {
        "index":"4",
        "goat":380.0,
        "stockX":375
    },
    {
        "index":"5",
        "goat":340.0,
        "stockX":349
    },
    {
        "index":"6",
        "goat":320.0,
        "stockX":344
    },
    {
        "index":"7",
        "goat":335.0,
        "stockX":339
    },
    {
        "index":"8",
        "goat":398.0,
        "stockX":389
    },
    {
        "index":"9",
        "goat":405.0,
        "stockX":398
    },
    {
        "index":"10",
        "goat":410.0,
        "stockX":410
    },
    {
        "index":"11",
        "goat":400.0,
        "stockX":398
    },
    {
        "index":"12",
        "goat":380.0,
        "stockX":383
    },
    {
        "index":"13",
        "goat":330.0,
        "stockX":324
    },
    {
        "index":"14",
        "goat":345.0,
        "stockX":338
    },
    {
        "index":"15",
        "goat":359.0,
        "stockX":304
    },
    {
        "index":"4.5",
        "goat":355.0,
        "stockX":400
    },
    {
        "index":"5.5",
        "goat":360.0,
        "stockX":350
    },
    {
        "index":"6.5",
        "goat":317.0,
        "stockX":315
    },
    {
        "index":"7.5",
        "goat":339.0,
        "stockX":375
    },
    {
        "index":"8.5",
        "goat":400.0,
        "stockX":415
    },
    {
        "index":"9.5",
        "goat":429.0,
        "stockX":425
    },
    {
        "index":"10.5",
        "goat":385.0,
        "stockX":390
    },
    {
        "index":"11.5",
        "goat":415.0,
        "stockX":399
    },
    {
        "index":"12.5",
        "goat":360.0,
        "stockX":345
    },
    {
        "index":"18",
        "goat":null,
        "stockX":5000
    }
]

However the data cannot load. The browser act as Loading the data all the time.

What’s my problem and how to fix it?

P.S the json_path is a variable that the content is a string of the correct path of the json file.