## The normal **FastAPI** app { #the-normal-fastapi-app }

Let's first see how the normal API app would look like before adding the callback.

It will have a *path operation* that will receive an `Invoice` body, and a query parameter `callback_url` that will contain the URL for the callback.

			if contextCanceled(ctx) {
				w.WriteHeader(499)
				return
			}
			f.ServeHTTP(w, r)
		case <-r.Context().Done():
			globalHTTPStats.addRequestsInQueue(-1)
			// When the client disconnects before getting the S3 handler
			// status code response, set the status code to 499 so this request
			// will be properly audited and traced.
			w.WriteHeader(499)
		default:
			globalHTTPStats.addRequestsInQueue(-1)

        grid.PutByteBuffer(result)
        return nil
    })
```

Context cancellation and timeouts are propagated to the handler.
The client does not wait for the remote handler to finish before returning.
Returning any error will also cancel the stream remotely.

CAREFUL: When utilizing two-way communication, it is important to ensure that the remote handler is not blocked on a send.

            failedValidations.incrementAndGet();
            throw new SmbException("Invalid command code: " + command);
        }
    }

    /**
     * Validate array size before allocation
     *
     * @param size array size to allocate
     * @param elementSize size of each element
     * @param maxElements maximum allowed elements
     * @throws SmbException if allocation would be too large

package callbacks

import (
	"fmt"
	"reflect"
	"strings"

	"gorm.io/gorm"
	"gorm.io/gorm/clause"
	"gorm.io/gorm/schema"
	"gorm.io/gorm/utils"
)

// BeforeCreate before create hooks
func BeforeCreate(db *gorm.DB) {
	if db.Error == nil && db.Statement.Schema != nil && !db.Statement.SkipHooks && (db.Statement.Schema.BeforeSave || db.Statement.Schema.BeforeCreate) {
		callMethod(db, func(value interface{}, tx *gorm.DB) (called bool) {

    - [SIG Node](#sig-node)
    - [SIG Network](#sig-network)
    - [SIG Scalability](#sig-scalability)
    - [SIG Scheduling](#sig-scheduling)
    - [SIG Storage](#sig-storage)
  - [Before Upgrading](#before-upgrading)
  - [Known Issues](#known-issues)
  - [Deprecations](#deprecations)
    - [Apps](#apps)
    - [Auth](#auth)
    - [Autoscaling](#autoscaling)
    - [Cluster Lifecycle](#cluster-lifecycle)

## Before Upgrading

Consider the following changes, limitations, and guidelines before you upgrade:

### **API Machinery**

Claims ## ref: http://kubernetes.io/docs/user-guide/persistent-volumes/ ## persistence: enabled: true annotations: {} ## A manually managed Persistent Volume and Claim ## Requires persistence.enabled: true ## If defined, PVC must be created manually before volume will be bound existingClaim: "" ## minio data Persistent Volume Storage Class ## If defined, storageClassName: <storageClass> ## If set to "-", storageClassName: "", which disables dynamic provisioning ## If undefined (the default) or set to...

Claims ## ref: http://kubernetes.io/docs/user-guide/persistent-volumes/ ## persistence: enabled: true annotations: {} ## A manually managed Persistent Volume and Claim ## Requires persistence.enabled: true ## If defined, PVC must be created manually before volume will be bound existingClaim: "" ## minio data Persistent Volume Storage Class ## If defined, storageClassName: <storageClass> ## If set to "-", storageClassName: "", which disables dynamic provisioning ## If undefined (the default) or set to...

Claims ## ref: http://kubernetes.io/docs/user-guide/persistent-volumes/ ## persistence: enabled: true annotations: {} ## A manually managed Persistent Volume and Claim ## Requires persistence.enabled: true ## If defined, PVC must be created manually before volume will be bound existingClaim: "" ## minio data Persistent Volume Storage Class ## If defined, storageClassName: <storageClass> ## If set to "-", storageClassName: "", which disables dynamic provisioning ## If undefined (the default) or set to...