How deeply does Django in Action cover HTTP 404 error?

Explains lookup, exception conversion, response handling, customization, and status-code testing, but not HTTP protocol internals.

HTTP 404 error

As explained in Django in Action

HTTP 404 Not Found is an HTTP response status indicating that the requested resource could not be found.

An HTTP 404 Not Found response tells the browser that the requested resource could not be found. In Django, a missing database object can become a 404 page instead of a crash or an empty result. section 4.6.1 section 8.4

A common detail-view flow captures an integer from the URL, passes it to get_object_or_404(), and renders the object when found. If the lookup finds nothing—or does not identify one object—the shortcut raises Http404; Django catches it and returns the 404 response. section 4.6.1

A missing musician

The route /bands/musician/100/ passes 100 as musician_id. If no Musician has that ID, the detail page is replaced by a 404 page. A real URL is public input, so the view must handle typed or otherwise invalid arguments rather than trusting links to be correct. section 4.6.1

How Django in Action covers it

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Also explained in

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ASP.NET Core in Action, 3eThe HTTP 404 status code indicates that the server cannot find the resource or endpoint identified by the request path.
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The Design of Web APIs, Second Edition404 is the HTTP status code indicating that the requested resource could not be found.

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Related concepts

HTTP response codekind of · An HTTP status code is a standardized three-digit value in an HTTP response that indicates the outcome of processing the corresponding request.
403 Forbiddencontrasts with · 403 Forbidden is an HTTP response status indicating that the server understood a request but refuses to authorize the requested access or operation.
web API action methodproduced by · A web API action method is a controller method associated with a matched HTTP request that processes it and produces a response.
endpointcontrasts with · An endpoint is a network-accessible address or interface through which a service exposes a resource or operation and handles requests and responses.
middlewareproduced by · Middleware is an intermediate software component or layer that processes or mediates requests, messages, or operations between other components, often adding behavior or controlling their flow.

This explainer was generated by Manning's knowledge graph from the text of Django in Action. The section links point to the parts of the book it draws on.