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content security policy (csp) tutorial: zero to hero

content security policy (csp) is a web security standard that helps prevent a variety of attacks, including cross-site scripting (xss) and data injection attacks. it allows you to specify which dynamic resources are allowed to load on your web pages, giving you fine-grained control over the content that can be executed.

table of contents

1. **what is csp?**
2. **why use csp?**
3. **how to implement csp?**
4. **csp directives**
5. **csp levels**
6. **example of csp in action**
7. **testing your csp**
8. **common csp issues**
9. **advanced csp techniques**
10. **conclusion**

---

1. what is csp?

csp is a security feature that allows you to define a whitelist of trusted sources for content that your web application can load. it helps mitigate the risk of content injection attacks by restricting how resources can be loaded and executed.

2. why use csp?

- **prevention of xss**: csp can significantly reduce the risk of xss attacks by controlling which scripts are allowed to run.
- **control over resources**: it allows you to control where resources such as images, scripts, styles, and fonts can be loaded from.
- **compliance**: many compliance standards require the implementation of security measures like csp.

3. how to implement csp?

csp can be implemented via http headers or `meta` tags in your html documents. the preferred way is to use http headers because it provides better security.

example of http header

```http
content-security-policy: default-src 'self'; script-src 'self' [ Ссылка ]; img-src 'self' data:;
```

example of `meta` tag

```html
meta http-equiv="content-security-policy" content="default-src 'self'; script-src 'self' [ Ссылка ]; img-src 'self' data:;"
```

4. csp directives

csp consists of several directives that control different types of resources. here are some of the most commonly used directives:

- **default-src**: serves as a fallback for other direc ...

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CSP
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CSP directives
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