You could create an API with a *path operation* that could trigger a request to an *external API* created by someone else (probably the same developer that would be *using* your API).

The process that happens when your API app calls the *external API* is named a "callback". Because the software that the external developer wrote sends a request to your API and then your API *calls back*, sending a request to an *external API* (that was probably created by the same developer).

	errFatal(err)

	// Start sending requests.
	go func() {
		for i := byte(0); i < 100; i++ {
			st.Requests <- []byte{i}
		}
		close(st.Requests)
	}()
	// Now do 100 other requests to ensure that the server doesn't block.
	for i := 0; i < 100; i++ {
		_, err := remoteConn.Request(ctx, handlerTest2, []byte(testPayload))
		errFatal(err)
	}
	// Start processing requests.
	close(processHandler)

	"github.com/minio/minio/internal/s3select"
	"github.com/minio/mux"
	"github.com/minio/pkg/v2/policy"
	"github.com/valyala/bytebufferpool"
)

// supportedHeadGetReqParams - supported request parameters for GET and HEAD presigned request.
var supportedHeadGetReqParams = map[string]string{
	"response-expires":             xhttp.Expires,
	"response-content-type":        xhttp.ContentType,
	"response-cache-control":       xhttp.CacheControl,

from .param_functions import Header as Header
from .param_functions import Path as Path
from .param_functions import Query as Query
from .param_functions import Security as Security
from .requests import Request as Request
from .responses import Response as Response
from .routing import APIRouter as APIRouter
from .websockets import WebSocket as WebSocket

You also define in some way at which **moments** your app will send those requests or events.

And **your users** define in some way (for example in a web dashboard somewhere) the **URL** where your app should send those requests.

                        EMPTY,
                        request);
            }

            validateRawRepositories(problems, m.getRepositories(), "repositories.repository.", EMPTY, request);

            validateRawRepositories(
                    problems, m.getPluginRepositories(), "pluginRepositories.pluginRepository.", EMPTY, request);

            Build build = m.getBuild();
            if (build != null) {

			return
		}
	}

	// Check if we are creating svc account for request sender.
	isSvcAccForRequestor := false
	if targetUser == requestorUser || targetUser == requestorParentUser {
		isSvcAccForRequestor = true
	}

	// If we are creating svc account for request sender, ensure
	// that targetUser is a real user (i.e. not derived
	// credentials).
	if isSvcAccForRequestor {

                null);
        InternalSession.associate(session, iSession);

        ArtifactResolutionResult result = repositorySystem.resolve(request);
        resolutionErrorHandler.throwErrors(request, result);
        assertEquals(2, result.getArtifacts().size());

        //
        // System scoped version which should
        //
        d.setScope(Artifact.SCOPE_SYSTEM);

	// use that and validate the authentication request. If not, we assume this
	// is an STS request for a claim based IDP (if one is present) and set
	// roleArn = openid.DummyRoleARN.
	//
	// Currently, we do not support multiple claim based IDPs, as there is no
	// defined parameter to disambiguate the intended IDP in this STS request.
	roleArn := openid.DummyRoleARN

		maxSetDrives := slices.Max(setDriveCounts)

		// Returns 75% of max memory allowed
		maxMem := availableMemory()

		// max requests per node is calculated as
		// total_ram / ram_per_request
		blockSize := xioutil.LargeBlock + xioutil.SmallBlock
		if legacy {
			// ram_per_request is (1MiB+32KiB) * driveCount \
			//    + 2 * 10MiB (default erasure block size v1) + 2 * 1MiB (default erasure block size v2)