假设你的浏览器中有一个前端运行在 `http://localhost:8080`，并且它的 JavaScript 正在尝试与运行在 `http://localhost` 的后端通信（因为我们没有指定端口，浏览器会采用默认的端口 `80`）。

然后，浏览器会向 `:80` 的后端发送一个 HTTP `OPTIONS` 请求，如果后端发送适当的 headers 来授权来自这个不同源（`http://localhost:8080`）的通信，那么运行在 `:8080` 的浏览器就会允许前端中的 JavaScript 向 `:80` 的后端发送请求。

为此，`:80` 的后端必须有一个「允许的源」列表。

在这种情况下，它必须包含 `http://localhost:8080`，这样 `:8080` 的前端才能正常工作。

## 通配符 { #wildcards }

也可以使用 `"*"`（一个「通配符」）声明这个列表，表示全部都是允许的。

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package cmd

import (
	"context"
	"os"
	"reflect"
	"testing"
)

// Tests stripping standard ports from apiEndpoints.
func TestStripStandardPorts(t *testing.T) {
	apiEndpoints := []string{"http://127.0.0.1:9000", "http://127.0.0.2:80", "https://127.0.0.3:443"}

  @Test fun readNameValueBlockDropsForbiddenHeadersHttp2() {
    val headerBlock =
      headersOf(
        ":status",
        "200 OK",
        ":version",
        "HTTP/1.1",
        "connection",
        "close",
      )
    val request = Request.Builder().url("http://square.com/").build()
    val response = readHttp2HeadersList(headerBlock, Protocol.HTTP_2).request(request).build()
    val headers = response.headers

            }
        };

        handlers.put("http", httpHandler);
        handlers.put("https", httpsHandler);
    }

    @Test
    void testGetDefaultPort() {
        // This test verifies that the handler returns the correct default HTTP port.
        assertEquals(Handler.DEFAULT_HTTP_PORT, handler.getDefaultPort(), "Default port should be 80 for HTTP.");
    }

    @Test

        // by the real connect() path using new URL()
        String[] specialUrls = { "http://localhost:9200/{index}/_search", "http://example.com/path?q=a|b",
                "http://example.com/page#section", "http://user:******@****.***/path", "http://localhost:9200/_cluster/health" };

        for (String specialUrl : specialUrls) {

### [URLs](https://square.github.io/okhttp/5.x/okhttp/okhttp3/-http-url/)

URLs (like `https://github.com/square/okhttp`) are fundamental to HTTP and the Internet. In addition to being a universal, decentralized naming scheme for everything on the web, they also specify how to access web resources.

URLs are abstract:

[http]
  [http.middlewares]

    [http.middlewares.api-stripprefix.stripPrefix]
      prefixes = ["/api/v1"]

  [http.routers]

    [http.routers.app-http]
      entryPoints = ["http"]
      service = "app"
      rule = "PathPrefix(`/api/v1`)"
      middlewares = ["api-stripprefix"]

  [http.services]

    [http.services.app]
      [http.services.app.loadBalancer]

=============

A scriptable web server for testing HTTP clients


### Motivation

This library makes it easy to test that your app Does The Right Thing when it
makes HTTP and HTTPS calls. It lets you specify which responses to return and
then verify that requests were made as expected.

Because it exercises your full HTTP stack, you can be confident that you're
testing everything. You can even copy & paste HTTP responses from your real web

See the [project website][okhttp] for documentation and APIs.

HTTP is the way modern applications network. It’s how we exchange data & media. Doing HTTP
efficiently makes your stuff load faster and saves bandwidth.

OkHttp is an HTTP client that’s efficient by default:

 * HTTP/2 support allows all requests to the same host to share a socket.
 * Connection pooling reduces request latency (if HTTP/2 isn’t available).
 * Transparent GZIP shrinks download sizes.

	}
}

var ssecUnsealObjectKeyTests = []struct {
	Headers        http.Header
	Bucket, Object string
	Metadata       map[string]string

	ExpectedErr error
}{
	{ // 0 - Valid HTTP headers and valid metadata entries for bucket/object
		Headers: http.Header{
			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},