Para conseguir isso, você pode usar a opção de linha de comando `--root-path` assim:

<div class="termy">

```console
$ fastapi run main.py --root-path /api/v1

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

Se você usar Hypercorn, ele também tem a opção `--root-path`.

/// note | "Detalhes Técnicos"

package cmd

import (
	"testing"
	"time"
)

var metaCacheTestsetTimestamp = time.Now()

var metaCacheTestset = []metacache{
	0: {
		id:           "case-1-normal",
		bucket:       "bucket",
		root:         "folder/prefix",
		recursive:    false,
		status:       scanStateSuccess,
		fileNotFound: false,
		error:        "",
		started:      metaCacheTestsetTimestamp,

      @Override
      long treeAggregate(@CheckForNull AvlNode<?> root) {
        return (root == null) ? 0 : root.totalCount;
      }
    },
    DISTINCT {
      @Override
      int nodeAggregate(AvlNode<?> node) {
        return 1;
      }

      @Override
      long treeAggregate(@CheckForNull AvlNode<?> root) {
        return (root == null) ? 0 : root.distinctElements;
      }
    };

 * under the License.
 */
package org.apache.maven.model.root;

import java.nio.file.Path;

import org.apache.maven.api.annotations.Nonnull;
import org.apache.maven.api.annotations.Nullable;

/**
 * Interface used to locate the root directory for a given project.
 *
 * The root locator is usually looked up from the plexus container.

				return
			}
		case "err":
			z.error, err = dc.ReadString()
			if err != nil {
				err = msgp.WrapError(err, "error")
				return
			}
		case "root":
			z.root, err = dc.ReadString()
			if err != nil {
				err = msgp.WrapError(err, "root")
				return
			}
		case "fnf":
			z.fileNotFound, err = dc.ReadBool()
			if err != nil {
				err = msgp.WrapError(err, "fileNotFound")
				return
			}

import okio.Okio;

public class SampleServer extends Dispatcher {
  private final SSLContext sslContext;
  private final String root;
  private final int port;

  public SampleServer(SSLContext sslContext, String root, int port) {
    this.sslContext = sslContext;
    this.root = root;
    this.port = port;
  }

  public void run() throws IOException {
    MockWebServer server = new MockWebServer();

    try (FileSystem fs = Jimfs.newFileSystem(Configuration.unix())) {
      Path root = fs.getRootDirectories().iterator().next();
      assertNull(root.getParent());
      assertNull(root.toRealPath().getParent());
      MoreFiles.createParentDirectories(root); // test that there's no exception
    }
  }

  public void testCreateParentDirectories_relativePath() throws IOException {

import org.w3c.dom.Document
import org.w3c.dom.Element
import org.w3c.dom.Node

class XIncludeAwareXmlProvider {

    Document root

    Element parse(File sourceFile) {
        root = parseSourceFile(sourceFile)
        root.documentElement
    }

    Node emptyDoc() {
        root = DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument()
    }

    void write(File destFile, boolean indent = false) {

	root := d.find(path)
	if root == nil || len(root.Children) == 0 {
		return root
	}
	flat := d.flatten(*root)
	return &flat
}

// totalChildrenRec returns the total number of children recorded.
func (d *dataUsageCache) totalChildrenRec(path string) int {
	root := d.find(path)
	if root == nil || len(root.Children) == 0 {
		return 0
	}

      @Override
      long treeAggregate(@CheckForNull AvlNode<?> root) {
        return (root == null) ? 0 : root.totalCount;
      }
    },
    DISTINCT {
      @Override
      int nodeAggregate(AvlNode<?> node) {
        return 1;
      }

      @Override
      long treeAggregate(@CheckForNull AvlNode<?> root) {
        return (root == null) ? 0 : root.distinctElements;
      }
    };