If for some reason you need to disable automatic conversion of underscores to hyphens, set the parameter `convert_underscores` of `Header` to `False`:

//// tab | Python 3.10+

```Python hl_lines="10"
{!> ../../docs_src/header_params/tutorial002_an_py310.py!}
```

////

//// tab | Python 3.9+

            """
        ),
    ] = None,
    convert_underscores: Annotated[
        bool,
        Doc(
            """
            Automatically convert underscores to hyphens in the parameter field name.

            Read more about it in the
            [FastAPI docs for Header Parameters](https://fastapi.tiangolo.com/tutorial/header-params/#automatic-conversion)
            """

ldap.admin.group.object.classes=groupOfNames
ldap.admin.sync.password=true

ldap.auth.validation=true
ldap.max.username.length=-1
ldap.ignore.netbios.name=true
ldap.group.name.with.underscores=false
ldap.lowercase.permission.name=false
ldap.allow.empty.permission=true

ldap.role.search.user.enabled=true
ldap.role.search.group.enabled=true
ldap.role.search.role.enabled=true

and <code>A</code> through <code>F</code> represent values 10 through 15.
</p>

<p>
For readability, an underscore character <code>_</code> may appear after
a base prefix or between successive digits; such underscores do not change
the literal's value.
</p>
<pre class="ebnf">
int_lit        = decimal_lit | binary_lit | octal_lit | hex_lit .

    /**
     * Get the value for the key 'ldap.group.name.with.underscores'. <br>
     * The value is, e.g. false <br>
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getLdapGroupNameWithUnderscores();

    /**
     * Is the property for the key 'ldap.group.name.with.underscores' true? <br>
     * The value is, e.g. false <br>

and <code>A</code> through <code>F</code> represent values 10 through 15.
</p>

<p>
For readability, an underscore character <code>_</code> may appear after
a base prefix or between successive digits; such underscores do not change
the literal's value.
</p>
<pre class="ebnf">
int_lit        = decimal_lit | binary_lit | octal_lit | hex_lit .

		case r == '_', r == '$':
			return r
		default:
			valid = false
			return -1
		}
	}, name)

	if valid {
		// check for simple name or quoted name
		// - letter/underscore followed by one or more letter/digit/underscore
		// - any text between quotes (text cannot contain a quote itself)
		if match, err := regexp.MatchString("^[a_][a0_$]*$", cleaned); err != nil {
			return err
		} else if match {
			return nil

 *
 * <p>If not all classes on the classpath should be covered, {@link #ignoreClasses} can be used to
 * exclude certain classes. As a special case, classes with an underscore in the name (like {@code
 * AutoValue_Foo}) can be excluded using <code>ignoreClasses({@link #UNDERSCORE_IN_NAME})</code>.
 *
 * <p>{@link #setDefault} allows subclasses to specify default values for types.
 *

 *
 * <p>If not all classes on the classpath should be covered, {@link #ignoreClasses} can be used to
 * exclude certain classes. As a special case, classes with an underscore in the name (like {@code
 * AutoValue_Foo}) can be excluded using <code>ignoreClasses({@link #UNDERSCORE_IN_NAME})</code>.
 *
 * <p>{@link #setDefault} allows subclasses to specify default values for types.
 *

	return b
}

// isSeparator reports whether the rune could mark a word boundary.
// TODO: update when package unicode captures more of the properties.
func isSeparator(r rune) bool {
	// ASCII alphanumerics and underscore are not separators
	if r <= 0x7F {
		switch {
		case '0' <= r && r <= '9':
			return false
		case 'a' <= r && r <= 'z':
			return false
		case 'A' <= r && r <= 'Z':
			return false
		case r == '_':