final String value = System.getProperty("java.protocol.handler.pkgs");
        if (StringUtil.isEmpty(value)) {
            buf.append("org.codelibs.fess.net.protocol");
        } else if (!value.contains("org.codelibs.fess.net.protocol")) {
            buf.append("|org.codelibs.fess.net.protocol");
        }
        if (buf.length() > 0) {
            System.setProperty("java.protocol.handler.pkgs", buf.toString());
        }
    }

        }
    }

    /**
     * Loads protocol handlers from the specified base package by scanning for
     * Handler classes in subpackages and registering them as web or file protocols
     * based on their PROTOCOL_TYPE field.
     *
     * @param basePackage the base package to scan for protocol handlers
     */
    protected void loadProtocols(final String basePackage) {

                ArtifactHandler handler =
                        container.lookup(ArtifactHandlerManager.class).getArtifactHandler(type);
                assertEquals(handler.getExtension(), extension, type + " extension");
                // Packaging/Directory is Maven1 remnant!!!
                // assertEquals(handler.getPackaging(), packaging, type + " packaging");

        synchronized (PROTOCOL_HANDLERS) {
            URLStreamHandler handler = PROTOCOL_HANDLERS.get(protocol);
            if (handler != null) {
                return handler;
            }
            if (factory != null) {
                handler = factory.createURLStreamHandler(protocol);
            }
            if (handler == null) {
                final String path = System.getProperty(HANDLER_PKGS_PROPERTY);

// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package handlers

import (
	"net/http"
	"testing"
)

type headerTest struct {
	key      string // header key
	val      string // header val
	expected string // expected result
}

This was changed in version 0.110.0 to fix unhandled memory consumption from forwarded exceptions without a handler (internal server errors), and to make it consistent with the behavior of regular Python code.

    private boolean includesDependencies;

    private String language;

    @Deprecated
    private boolean addedToClasspath;

    /**
     * Default ctor for Plexus compatibility, as many plugins have artifact handlers declared in legacy Plexus XML.
     * Do not use directly!
     *
     * @deprecated This ctor is present only for Plexus XML defined component compatibility, do not use it.
     */
    @Deprecated

	globalRemoteTargetTransport http.RoundTripper

	globalDNSCache = &dnscache.Resolver{
		Timeout: 5 * time.Second,
	}

	globalForwarder *handlers.Forwarder

	globalTierConfigMgr *TierConfigMgr

	globalConsoleSrv *consoleapi.Server

	// handles service freeze or un-freeze S3 API calls.
	globalServiceFreeze atomic.Value

	// Only needed for tracking
	globalServiceFreezeCnt int32

new_app = UnicornMiddleware(app, some_config="rainbow")
```

But FastAPI (actually Starlette) provides a simpler way to do it that makes sure that the internal middlewares handle server errors and custom exception handlers work properly.

For that, you use `app.add_middleware()` (as in the example for CORS).

```Python
from fastapi import FastAPI
from unicorn import UnicornMiddleware

app = FastAPI()

participant client as Client
participant handler as Exception handler
participant dep as Dep with yield
participant operation as Path Operation
participant tasks as Background tasks

    Note over client,operation: Can raise exceptions, including HTTPException
    client ->> dep: Start request
    Note over dep: Run code up to yield
    opt raise Exception
        dep -->> handler: Raise Exception