> ## Documentation Index
> Fetch the complete documentation index at: https://clickhouse.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# http_* session settings

> ClickHouse session settings in the http_* generated group.

export const SettingsInfoBlock = ({type, default_value, changeable_without_restart}) => {
  return <div className="not-prose" style={{
    display: "flex",
    flexWrap: "wrap",
    alignItems: "baseline",
    columnGap: "0.5rem",
    rowGap: "0.125rem",
    margin: "0.375rem 0",
    fontSize: "0.8125rem",
    lineHeight: "1.125rem"
  }}>
      <div style={{
    fontWeight: 600,
    opacity: 0.72
  }}>Type</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{type}</div>
      <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>Default</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{default_value}</div>
      {changeable_without_restart && <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>
          Changeable without restart
        </div>}
      {changeable_without_restart && <div style={{
    overflowWrap: "anywhere"
  }}>
          {changeable_without_restart}
        </div>}
    </div>;
};

These settings are available in [system.settings](/docs/reference/system-tables/settings) and are autogenerated from [source](https://github.com/ClickHouse/ClickHouse/blob/master/src/Core/Settings.cpp).

<h2 id="http_connection_timeout">
  http\_connection\_timeout
</h2>

<SettingsInfoBlock type="Seconds" default_value="1" />

HTTP connection timeout (in seconds).

Possible values:

* Any positive integer.
* 0 - Disabled (infinite timeout).

<h2 id="http_make_head_request">
  http\_make\_head\_request
</h2>

<SettingsInfoBlock type="Bool" default_value="1" />

The `http_make_head_request` setting allows the execution of a `HEAD` request while reading data from HTTP to retrieve information about the file to be read, such as its size. Since it's enabled by default, it may be desirable to disable this setting in cases where the server does not support `HEAD` requests.

<h2 id="http_native_compression_disable_checksumming_on_decompress">
  http\_native\_compression\_disable\_checksumming\_on\_decompress
</h2>

<SettingsInfoBlock type="Bool" default_value="0" />

Enables or disables checksum verification when decompressing the HTTP POST data from the client. Used only for ClickHouse native compression format (not used with `gzip` or `deflate`).

For more information, read the [HTTP interface description](/docs/concepts/features/interfaces/http).

Possible values:

* 0 — Disabled.
* 1 — Enabled.

<h2 id="http_receive_timeout">
  http\_receive\_timeout
</h2>

<SettingsInfoBlock type="Seconds" default_value="30" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "23.6"},{"label": "30"},{"label": "See http_send_timeout."}]}]} />

HTTP receive timeout (in seconds).

Possible values:

* Any positive integer.
* 0 - Disabled (infinite timeout).

<h2 id="http_send_timeout">
  http\_send\_timeout
</h2>

<SettingsInfoBlock type="Seconds" default_value="30" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "23.6"},{"label": "30"},{"label": "3 minutes seems crazy long. Note that this is timeout for a single network write call, not for the whole upload operation."}]}]} />

HTTP send timeout (in seconds).

Possible values:

* Any positive integer.
* 0 - Disabled (infinite timeout).

<Note>
  It's applicable only to the default profile. A server reboot is required for the changes to take effect.
</Note>

<h2 id="http_skip_not_found_url_for_globs">
  http\_skip\_not\_found\_url\_for\_globs
</h2>

<SettingsInfoBlock type="Bool" default_value="1" />

Skip URLs for globs with HTTP\_NOT\_FOUND error

<h2 id="http_wait_end_of_query">
  http\_wait\_end\_of\_query
</h2>

<SettingsInfoBlock type="Bool" default_value="0" />

Enable HTTP response buffering on the server-side.

<h2 id="http_write_exception_in_output_format">
  http\_write\_exception\_in\_output\_format
</h2>

<SettingsInfoBlock type="Bool" default_value="0" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "25.11"},{"label": "0"},{"label": "Changed for consistency across formats"}]}, {"id": "row-2","items": [{"label": "23.9"},{"label": "1"},{"label": "Output valid JSON\/XML on exception in HTTP streaming."}]}]} />

Write exception in output format to produce valid output. Works with JSON and XML formats.

<h2 id="http_zlib_compression_level">
  http\_zlib\_compression\_level
</h2>

<SettingsInfoBlock type="Int64" default_value="3" />

Sets the level of data compression in the response to an HTTP request if [enable\_http\_compression = 1](/docs/reference/settings/session-settings/enable#enable_http_compression).

Possible values: Numbers from 1 to 12. Levels above `9` require the default build with `libdeflate`; a build without `libdeflate` supports levels 1 to 9.