# Body - Multiple Parameters

Now that we have seen how to use `Path` and `Query`, let's see more advanced uses of request body declarations.

## Mix `Path`, `Query` and body parameters

First, of course, you can mix `Path`, `Query` and request body parameter declarations freely and **FastAPI** will know what to do.

And you can also declare body parameters as optional, by setting the default to `None`:

//// tab | Python 3.10+

rchable\":true,\"aggregatable\":true,\"readFromDocValues\":false},{\"name\":\"_score\",\"type\":\"number\",\"count\":0,\"scripted\":false,\"searchable\":false,\"aggregatable\":false,\"readFromDocValues\":false},{\"name\":\"_source\",\"type\":\"_source\",\"esTypes\":[\"_source\"],\"count\":0,\"scripted\":false,\"searchable\":false,\"aggregatable\":false,\"readFromDocValues\":false},{\"name\":\"_type\",\"type\":\"string\",\"esTypes\":[\"_type\"],\"count\":0,\"scripted\":false,\"searchable\":true,\...

          @ParametricNullness E key,
          List<? extends E> list,
          int foundIndex) {
        // Of course, we have to use binary search to find the precise
        // breakpoint...
        int lower = 0;
        int upper = foundIndex;
        // Of course, we have to use binary search to find the precise breakpoint...
        // Everything between lower and upper inclusive compares at <= 0.

      <instantiationStrategy>per-lookup</instantiationStrategy>
      <executionStrategy>once-per-session</executionStrategy>
      <deprecated>deprecated-mojo</deprecated>
      <since>2.2</since>
      <executePhase>generate-sources</executePhase>
      <executeGoal>some-goal</executeGoal>
      <executeLifecycle>cobertura</executeLifecycle>
      <configurator>antrun</configurator>
      <parameters>
        <parameter>

       release artifact directory is not expected to provide metadata.

 []

 The following are generated from this model:

   * {{{./apidocs/index.html}Java sources}} with Reader and Writers for the Xpp3 XML parser, to read and write <<<maven-metadata(-*).xml>>> files,

   * a {{{./repository-metadata.html}Descriptor Reference}}.
 

out=$(diff -qpruN /tmp/sitea.txt /tmp/siteb.txt)
ret=$?
if [ $ret -ne 0 ]; then
	echo "BUG: expected no 'diff' after replication: $out"
	exit 1
fi

./mc rm -r --force --versions sitea/bucket/marker
sleep 14s ## sleep for 14s idea is that we give 100ms per object.

./mc ls -r --versions sitea/bucket >/tmp/sitea.txt
./mc ls -r --versions siteb/bucket >/tmp/siteb.txt

# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
# Note: this file gets sourced in utilities/setup.sh, which has "set -u"
# (error on undefined variables). This ensures that (a) every TFCI variable
# has an explicit default value, and (b) no script can accidentally use a

 building logic from multiple settings files is done in {{{../maven-settings-builder/}Maven Settings Builder}}.

 The following are generated from this model:

   * {{{./apidocs/index.html}Java sources}} with Reader and Writers for the Xpp3 XML parser, <<<ToAPiV3()>>> and <<<ToApiV4()>>> transformers, and <<<v4>>> package
     for Merger and v4 Reader and Writers for the Xpp3 XML parser,

```

////

But know that this is deprecated and it should be updated to use the new parameter `pattern`. 🤓

## Default values

You can, of course, use default values other than `None`.

Let's say that you want to declare the `q` query parameter to have a `min_length` of `3`, and to have a default value of `"fixedquery"`:

//// tab | Python 3.9+

	\
	Write-Host 'Verifying pip install ...'; \
	C:\python312\python.exe -m pip --version; \
	\
	Write-Host 'Removing ...'; \
	Remove-Item C:\tmp\pyinstall.exe -Force; \
	\
	Write-Host 'Complete.';

# Install pip packages.
RUN python -m pip install --ignore-installed --force-reinstall --upgrade \
    setuptools packaging

# Install JDK 21.
RUN \
  Add-Type -AssemblyName \"System.IO.Compression.FileSystem\"; \