# CORS（跨域资源共享）

<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS" class="external-link" target="_blank">CORS 或者「跨域资源共享」</a> 指浏览器中运行的前端拥有与后端通信的 JavaScript 代码，而后端处于与前端不同的「源」的情况。

## 源

源是协议（`http`，`https`）、域（`myapp.com`，`localhost`，`localhost.tiangolo.com`）以及端口（`80`、`443`、`8080`）的组合。

因此，这些都是不同的源：

* `http://localhost`
* `https://localhost`
* `http://localhost:8080`

即使它们都在 `localhost` 中，但是它们使用不同的协议或者端口，所以它们都是不同的「源」。

## 步骤

		<Property name="root.log.level" value="${sys:fess.log.level:-warn}" />
		<Property name="log.pattern" value="%d [%t] %-5p %msg%n" />
		<Property name="log.file.basedir" value="${sys:fess.log.path:-target/logs}" />
		<Property name="backup.date.suffix" value="_%d{yyyyMMdd}" />
		<Property name="backup.max.history" value="10" />
	</Properties>

	<Appenders>

		<Property name="root.log.level" value="${sys:fess.log.level:-warn}" />
		<Property name="log.pattern" value="%d [%t] %-5p %msg%n" />
		<Property name="log.file.basedir" value="${sys:fess.log.path:-target/logs}" />
		<Property name="backup.date.suffix" value="_%d{yyyyMMdd}" />
		<Property name="backup.max.history" value="10" />
	</Properties>

	<Appenders>

            auth.setPassword(password);
            params.put(FtpClient.FTP_AUTHENTICATIONS_PROPERTY, new FtpAuthentication[] { auth });
            ftpClient.setInitParameterMap(params);

            ftpClient.doGet("ftp://localhost:" + FTP_PORT + "/");
            fail();
        } catch (final ChildUrlsException e) {
            final Set<RequestData> urlSet = e.getChildUrlList();
            assertEquals(5, urlSet.size());

/target/
/work/
/bin/
/mydbflute/
/solr/data/
/src/main/webapp/WEB-INF/classes/
/src/main/webapp/WEB-INF/lib/
/src/main/webapp/WEB-INF/site/
/src/main/webapp/WEB-INF/plugin/*
!/src/main/webapp/WEB-INF/plugin/.keep
/src/main/webapp/WEB-INF/env/crawler/lib/
/src/main/webapp/WEB-INF/env/suggest/lib/
/src/main/webapp/WEB-INF/env/thumbnail/lib/
/src/main/webapp/WEB-INF/thumbnails/
/src/main/webapp/jar/
/dbflute_fess/extlib/*

        if (configList.isEmpty()) {
            // nothing
            if (logger.isInfoEnabled()) {
                logger.info("No crawling target data.");
            }
            return;
        }

        doCrawl(sessionId, configList);
    }

    public void crawl(final String sessionId, final List<String> configIdList) {

        // WEB-INF/classes
        buf.append("WEB-INF");
        buf.append(File.separator);
        buf.append("classes");
        // target/classes
        final String userDir = System.getProperty("user.dir");
        final File targetDir = new File(userDir, "target");
        final File targetClassesDir = new File(targetDir, "classes");
        if (targetClassesDir.isDirectory()) {
            buf.append(cpSeparator);

        // WEB-INF/classes
        buf.append("WEB-INF");
        buf.append(File.separator);
        buf.append("classes");
        // target/classes
        final String userDir = System.getProperty("user.dir");
        final File targetDir = new File(userDir, "target");
        final File targetClassesDir = new File(targetDir, "classes");
        if (targetClassesDir.isDirectory()) {
            buf.append(cpSeparator);

  /**
   * Version of {@link IteratorTester} that compares an iterator over a given collection of elements
   * (used as the reference iterator) against a {@code PeekingIterator} that *wraps* such an
   * iterator (used as the target iterator).
   *
   * <p>This IteratorTester makes copies of the master so that it can later verify that {@link
   * PeekingIterator#remove()} removes the same elements as the reference's iterator {@code
   * #remove()}.
   */

프로덕션 환경에서는 `fastapi run` 명령어를 사용합니다. 🚀

내부적으로, **FastAPI CLI**는 고성능의, 프로덕션에 적합한, ASGI 서버인 <a href="https://www.uvicorn.org" class="external-link" target="_blank">Uvicorn</a>을 사용합니다. 😎

## `fastapi dev`

`fastapi dev` 명령을 실행하면 개발 모드가 시작됩니다.