> ## Documentation Index
> Fetch the complete documentation index at: https://easyaf.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# CrossOriginIsolationMiddleware

> Middleware that adds Cross-Origin Isolation headers (COOP and COEP) to responses.              These headers are required for features like SharedArrayBuffer...

## Definition

**Assembly:** CloudNimble.BlazorEssentials.Server.dll

**Namespace:** CloudNimble.BlazorEssentials.Server.Middleware

**Inheritance:** System.Object

## Syntax

```csharp theme={"dark"}
CloudNimble.BlazorEssentials.Server.Middleware.CrossOriginIsolationMiddleware
```

## Summary

Middleware that adds Cross-Origin Isolation headers (COOP and COEP) to responses.
These headers are required for features like SharedArrayBuffer and high-resolution timers,
which are needed by WASM libraries like TursoDb that use OPFS (Origin Private File System).

## Remarks

\<strong>Warning:\</strong> Enabling cross-origin isolation may break third-party scripts,
iframes, and CDN resources that are not configured to work in an isolated context.
Test thoroughly before enabling in production.

Headers added:

* `Cross-Origin-Opener-Policy: same-origin` - Isolates the browsing context
* `Cross-Origin-Embedder-Policy: require-corp` - Requires all resources to explicitly grant permission

## Examples

```csharp theme={"dark"}
// In Program.cs
app.UseCrossOriginIsolation();

// Or with options
app.UseCrossOriginIsolation(options =&gt;
{
    options.CoopPolicy = "same-origin";
    options.CoepPolicy = "require-corp";
    options.ExcludePaths.Add("/api/");
});
```

## Constructors

### <Icon icon="hammer" iconType="duotone" color="#419AC5" size={24} className="mr-2" /> .ctor

Initializes a new instance of the [CrossOriginIsolationMiddleware](/blazoressentials/api-reference/CloudNimble/BlazorEssentials/Server/Middleware/CrossOriginIsolationMiddleware) class.

#### Syntax

```csharp theme={"dark"}
public CrossOriginIsolationMiddleware(Microsoft.AspNetCore.Http.RequestDelegate next, CloudNimble.BlazorEssentials.Server.Middleware.CrossOriginIsolationOptions options = null)
```

#### Parameters

| Name      | Type                                                                          | Description                                       |
| --------- | ----------------------------------------------------------------------------- | ------------------------------------------------- |
| `next`    | `Microsoft.AspNetCore.Http.RequestDelegate`                                   | The next middleware in the pipeline.              |
| `options` | `CloudNimble.BlazorEssentials.Server.Middleware.CrossOriginIsolationOptions?` | Configuration options for cross-origin isolation. |

### <Icon icon="hammer" iconType="duotone" color="#419AC5" size={24} className="mr-2" /> .ctor <Badge color="gray">Inherited</Badge>

<Note>Inherited from `object`</Note>

#### Syntax

```csharp theme={"dark"}
public Object()
```

## Methods

### <Icon icon="code-fork" iconType="duotone" color="#419AC5" size={24} className="mr-2" /> Equals <Badge color="gray">Inherited</Badge> <Badge color="orange">Virtual</Badge>

<Note>Inherited from `object`</Note>

#### Syntax

```csharp theme={"dark"}
public virtual bool Equals(object obj)
```

#### Parameters

| Name  | Type      | Description |
| ----- | --------- | ----------- |
| `obj` | `object?` | -           |

#### Returns

Type: `bool`

### <Icon icon="thumbtack" iconType="duotone" color="#419AC5" size={24} className="mr-2" /> Equals <Badge color="gray">Inherited</Badge>

<Note>Inherited from `object`</Note>

#### Syntax

```csharp theme={"dark"}
public static bool Equals(object objA, object objB)
```

#### Parameters

| Name   | Type      | Description |
| ------ | --------- | ----------- |
| `objA` | `object?` | -           |
| `objB` | `object?` | -           |

#### Returns

Type: `bool`

### <Icon icon="code-fork" iconType="duotone" color="#419AC5" size={24} className="mr-2" /> GetHashCode <Badge color="gray">Inherited</Badge> <Badge color="orange">Virtual</Badge>

<Note>Inherited from `object`</Note>

#### Syntax

```csharp theme={"dark"}
public virtual int GetHashCode()
```

#### Returns

Type: `int`

### <Icon icon="function" iconType="duotone" color="#419AC5" size={24} className="mr-2" /> GetType <Badge color="gray">Inherited</Badge>

<Note>Inherited from `object`</Note>

#### Syntax

```csharp theme={"dark"}
public System.Type GetType()
```

#### Returns

Type: `System.Type`

### <Icon icon="function" iconType="duotone" color="#419AC5" size={24} className="mr-2" /> InvokeAsync

Invokes the middleware to add cross-origin isolation headers.

#### Syntax

```csharp theme={"dark"}
public System.Threading.Tasks.Task InvokeAsync(Microsoft.AspNetCore.Http.HttpContext context)
```

#### Parameters

| Name      | Type                                    | Description       |
| --------- | --------------------------------------- | ----------------- |
| `context` | `Microsoft.AspNetCore.Http.HttpContext` | The HTTP context. |

#### Returns

Type: `System.Threading.Tasks.Task`
A task representing the asynchronous operation.

### <Icon icon="function" iconType="duotone" color="#419AC5" size={24} className="mr-2" /> MemberwiseClone <Badge color="gray">Inherited</Badge>

<Note>Inherited from `object`</Note>

#### Syntax

```csharp theme={"dark"}
protected internal object MemberwiseClone()
```

#### Returns

Type: `object`

### <Icon icon="thumbtack" iconType="duotone" color="#419AC5" size={24} className="mr-2" /> ReferenceEquals <Badge color="gray">Inherited</Badge>

<Note>Inherited from `object`</Note>

#### Syntax

```csharp theme={"dark"}
public static bool ReferenceEquals(object objA, object objB)
```

#### Parameters

| Name   | Type      | Description |
| ------ | --------- | ----------- |
| `objA` | `object?` | -           |
| `objB` | `object?` | -           |

#### Returns

Type: `bool`

### <Icon icon="code-fork" iconType="duotone" color="#419AC5" size={24} className="mr-2" /> ToString <Badge color="gray">Inherited</Badge> <Badge color="orange">Virtual</Badge>

<Note>Inherited from `object`</Note>

#### Syntax

```csharp theme={"dark"}
public virtual string ToString()
```

#### Returns

Type: `string?`