All Products
Search

This Product

    ApsaraVideo VOD:Throttling functions

    Document Center

    ApsaraVideo VOD:Throttling functions

    Last Updated:Jul 10, 2026

    You can use throttling functions to control the data transfer rate for individual requests.

    limit_rate_after

    Item Description
    Syntax limit_rate_after(n, unit)
    Description Sets the amount of data that can be transferred before rate limiting takes effect.
    Note This function applies to an individual request and is not a global bandwidth limit.
    Parameters
    • unit: An integer. If you do not specify the parameter, the default unit is bytes.
    • unitKMG: A char. Valid values are , , or . The values are case-insensitive.
    Return value truefalseReturns on success or on failure.
    Examples 
    limit_rate_after(10, 'k')
limit_rate(1, 'm') 
// After the first 10 KB is transferred, the rate is limited to 1 MB/s.

    limit_rate

    Item Description
    Syntax limit_rate(n, unit)
    Description Sets the data transfer rate for a request. The minimum rate is 4 KB/s. If you specify a rate lower than 4 KB/s, the rate defaults to 4 KB/s.
    Note This function applies to an individual request and is not a global bandwidth limit.
    Parameters
    • unit: An integer. If you do not specify the parameter, the default unit is bytes/s.
    • unitKMG: A char. Valid values are , , or . The values are case-insensitive.
    Return value truefalseReturns on success or on failure.
    Examples 
    limit_rate(500, 'k')
// Limits the data transfer rate to 500 KB/s.