> ## 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.

# url_* session settings

> ClickHouse session settings in the url_* 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="url_base">
  url\_base
</h2>

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.5"},{"label": ""},{"label": "New setting to specify the base URL for resolving relative URLs in the url table function and URL table engine."}]}]} />

The base URL used to resolve relative URLs in the [url](/docs/reference/functions/table-functions/url) table function and the [URL](/docs/reference/engines/table-engines/special/url) table engine.

When set, relative URLs are resolved as follows:

* Path-relative URL (e.g. `data.csv`): merged with the base URL path per RFC 3986. Everything after the last `/` in the base path is replaced by the relative URL, so a trailing slash matters: `https://example.com/dir/` + `data.csv` = `https://example.com/dir/data.csv`, but `https://example.com/dir` + `data.csv` = `https://example.com/data.csv`. If the base has no path (e.g. `https://example.com`), a `/` is inserted: `https://example.com/data.csv`. Dot segments (`./` and `../`) in the relative URL are normalized: `https://example.com/dir/` + `../a.csv` = `https://example.com/a.csv`.
* Host-relative URL (e.g. `/test/data.csv`): resolved against the base URL's scheme and host.
* Scheme-relative URL (e.g. `//other.com/test/data.csv`): resolved using the base URL's scheme.
* Query-only reference (e.g. `?x=1`): appended to the base URL path (replacing any existing query/fragment).
* Fragment-only reference (e.g. `#frag`): appended to the base URL, preserving any query string (replacing any existing fragment).
* Empty reference: returns the base URL without fragment.

For example, if `url_base` is `https://example.com/def/`, then:

* `data.csv` resolves to `https://example.com/def/data.csv`
* `/test/data.csv` resolves to `https://example.com/test/data.csv`
* `//other.com/test/data.csv` resolves to `https://other.com/test/data.csv`

<h2 id="url_wildcard_max_directories_to_read">
  url\_wildcard\_max\_directories\_to\_read
</h2>

<SettingsInfoBlock type="UInt64" default_value="100000" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.7"},{"label": "100000"},{"label": "New setting to limit the number of directories read when expanding wildcards in the `url` table function."}]}]} />

Maximum number of directories that can be traversed while expanding URL wildcards from index pages.