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Asked: 2026-06-11T10:31:14+00:00

How do I get the size of the response/request body in Mod Security? I

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How do I get the size of the response/request body in Mod Security?

I keep getting this error for example:

[Mon Sep 17 23:34:38 2012] [error] [client 192.168.1.1] ModSecurity: Output filter: Response body too large (over limit of 1000, total not specified). [hostname "example.com"] [uri "/index.php"] [unique_id "asdf"]

It’s not telling me the total; how can I figure the total out?

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1 Answer

  1. Editorial Team

    Take a look at the SecResponseBodyLimit docs:

    SecResponseBodyLimit

    Description: Configures the maximum response body size that will be accepted for buffering.

    Syntax: SecResponseBodyLimit NUMBER_IN_BYTES

    Example Usage: SecResponseBodyLimit 524228

    Processing Phase: N/A

    Scope: Any

    Dependencies/Notes: Anything over this limit will be rejected with status code 500 Internal Server Error. This setting will not affect the responses with MIME types that are not marked for buffering. There is a hard limit of 1 GB.

    By default this limit is configured to 512 KB:

    # Buffer response bodies of up to 512 KB in length
    SecResponseBodyLimit 524288

    For some reason, you have it set to "1000" and /index.php‘s output is larger than 1000 bytes.

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