Editing Web server (section)

===Symptoms of overload===
The symptoms of an overloaded web server are usually the following ones (e.g.).
* Requests are served with (possibly long) delays (from 1 second to a few hundred seconds).
* The web server returns an [[List of HTTP status codes|HTTP error code]], such as 500, 502,<ref>{{Cite web|url=https://www.lifewire.com/502-bad-gateway-error-explained-2622939|title=Getting a 502 Bad Gateway Error? Here's What to Do|last1=Fisher|first1=Tim|last2=Lifewire|website=Lifewire|language=en|access-date=2019-02-01|archive-date=23 February 2017|archive-url=https://web.archive.org/web/20170223042443/https://www.lifewire.com/502-bad-gateway-error-explained-2622939|url-status=live}}</ref><ref>{{Cite web|url=https://www.itpro.co.uk/go/30258|title=What is a 502 bad gateway and how do you fix it?|website=IT PRO|language=en|access-date=2019-02-01|archive-date=20 January 2023|archive-url=https://web.archive.org/web/20230120185257/https://www.itpro.co.uk/web-hosting/30258/what-is-a-502-bad-gateway-and-how-do-you-fix-it|url-status=live}}</ref> 503,<ref>{{Cite web|url=https://www.lifewire.com/503-service-unavailable-explained-2622940|title=Getting a 503 Service Unavailable Error? Here's What to Do|last1=Fisher|first1=Tim|last2=Lifewire|website=Lifewire|language=en|access-date=2019-02-01|archive-date=20 January 2023|archive-url=https://web.archive.org/web/20230120185318/https://www.lifewire.com/503-service-unavailable-explained-2622940|url-status=live}}</ref> 504,<ref>{{Cite web|url=https://www.lifewire.com/504-gateway-timeout-error-explained-2622941|title=Getting a 504 Gateway Timeout Error? Here's What to Do|last1=Fisher|first1=Tim|last2=Lifewire|website=Lifewire|language=en|access-date=2019-02-01|archive-date=23 April 2021|archive-url=https://web.archive.org/web/20210423182953/https://www.lifewire.com/504-gateway-timeout-error-explained-2622941|url-status=live}}</ref> 408, or even an intermittent [[HTTP 404|404]].
* The web server refuses or resets (interrupts) [[Transmission control protocol|TCP]] connections before it returns any content.
* In very rare cases, the web server returns only a part of the requested content. This behavior can be considered a [[Software bug|bug]], even if it usually arises as a symptom of overload.