Meaning of "HTTPServer: error: short send after timeout"

[jmmprodukts]

Basic Infos

• This issue complies with the issue POLICY doc.
• I have read the documentation at readthedocs and the issue is not addressed there.
• I have tested that the issue is present in current master branch (aka latest git).
• I have searched the issue tracker for a similar issue.
• If there is a stack dump, I have decoded it.
• I have filled out all fields below.

Platform

• Hardware: ESP8266
• Core Version: Unknown
• Development Env: Arduino IDE
• Operating System: Windows 11

Settings in IDE

• Module: Wemos D1 mini
• Flash Mode: [qio|dio|other]
• Flash Size: [4MB/1MB]
• lwip Variant: [v1.4|v2 Lower Memory|Higher Bandwidth]
• Reset Method: [ck|nodemcu]
• Flash Frequency: [40Mhz]
• CPU Frequency: [80Mhz|160MHz]
• Upload Using: [OTA]
• Upload Speed: [115200)

Problem Description

After multiple requests from a browser to the EP8266 webserver I get the following on the serial port (with DEBUG LEVEL HTTP_CLIENT+HTTP_SERVER

MCVE Sketch

Debug Messages

2024-04-18 13:09:26 Zomertijd 12600 36>New client
request: GET /FolderPage HTTP/1.1
method: GET url: /FolderPage search: keepAlive=: 1
headerName: Host
headerValue: 192.168.2.238
headerName: Connection
headerValue: keep-alive
headerName: Cache-Control
headerValue: max-age=0
headerName: DNT
headerValue: 1
headerName: Upgrade-Insecure-Requests
headerValue: 1
headerName: User-Agent
headerValue: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36
headerName: Accept
headerValue: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,/;q=0.8,application/signed-exchange;v=b3;q=0.7
headerName: Referer
headerValue: http://192.168.2.238/
headerName: Accept-Encoding
headerValue: gzip, deflate
headerName: Accept-Language
headerValue: en-US,en;q=0.9,nl-NL;q=0.8,nl;q=0.7
headerName: sec-gpc
headerValue: 1
args:
args count: 0
args:
args count: 0
Request: /FolderPage
Arguments:
final list of key/value pairs:
HTTPServer: error: sent 0 on 103 bytes
HTTPServer: error: short send after timeout (0 < 25)
HTTPServer: error: short send after timeout (0 < 24)
HTTPServer: error: short send after timeout (0 < 26)
HTTPServer: error: short send after timeout (0 < 5)
HTTPServer: error: short send after timeout (0 < 11)
HTTPServer: error: short send after timeout (0 < 2)
HTTPServer: error: short send after timeout (0 < 3)
HTTPServer: error: short send after timeout (0 < 18)
HTTPServer: error: short send after timeout (0 < 4)
HTTPServer: error: short send after timeout (0 < 3)
HTTPServer: error: short send after timeout (0 < 292)
HTTPServer: error: short send after timeout (0 < 28)
HTTPServer: error: short send after timeout (0 < 546)
HTTPServer: error: short send after timeout (0 < 592)
HTTPServer: error: short send after timeout (0 < 8)
HTTPServer: error: short send after timeout (0 < 10)
HTTPServer: error: short send after timeout (0 < 19)
HTTPServer: error: short send after timeout (0 < 41)
HTTPServer: error: short send after timeout (0 < 3)
HTTPServer: error: short send after timeout (0 < 24)
HTTPServer: error: short send after timeout (0 < 35)
HTTPServer: error: short send after timeout (0 < 28)
HTTPServer: error: short send after timeout (0 < 103)
HTTPServer: error: short send after timeout (0 < 10)
HTTPServer: error: short send after timeout (0 < 36)
HTTPServer: error: short send after timeout (0 < 38)
HTTPServer: error: short send after timeout (0 < 38)
HTTPServer: error: short send after timeout (0 < 71)
HTTPServer: error: short send after timeout (0 < 60)
HTTPServer: error: short send after timeout (0 < 58)
HTTPServer: error: short send after timeout (0 < 58)
HTTPServer: error: short send after timeout (0 < 36)
HTTPServer: error: short send after timeout (0 < 28)
HTTPServer: error: short send after timeout (0 < 5)
HTTPServer: error: short send after timeout (0 < 3)
HTTPServer: error: short send after timeout (0 < 34)
HTTPServer: error: short send after timeout (0 < 126)
HTTPServer: error: short send after timeout (0 < 53)
HTTPServer: error: short send after timeout (0 < 49)
HTTPServer: error: short send after timeout (0 < 78)
HTTPServer: error: short send after timeout (0 < 3)
HTTPServer: error: short send after timeout (0 < 35)
HTTPServer: error: short send after timeout (0 < 54)
HTTPServer: error: short send after timeout (0 < 31)
HTTPServer: error: short send after timeout (0 < 3)
HTTPServer: error: short send after timeout (0 < 32)
HTTPServer: error: short send after timeout (0 < 44)
HTTPServer: error: short send after timeout (0 < 3)
HTTPServer: error: short send after timeout (0 < 32)
HTTPServer: error: short send after timeout (0 < 45)
HTTPServer: error: short send after timeout (0 < 3)
HTTPServer: error: short send after timeout (0 < 11)
HTTPServer: error: short send after timeout (0 < 54)
HTTPServer: error: short send after timeout (0 < 71)
HTTPServer: error: short send after timeout (0 < 723)
HTTPServer: error: short send after timeout (0 < 8)
HTTPServer: error: short send after timeout (0 < 28)
HTTPServer: error: short send after timeout (0 < 22)
HTTPServer: error: short send after timeout (0 < 22)
HTTPServer: error: short send after timeout (0 < 22)
HTTPServer: error: short send after timeout (0 < 22)
HTTPServer: error: short send after timeout (0 < 2)
HTTPServer: error: short send after timeout (0 < 11)
HTTPServer: error: short send after timeout (0 < 29)
HTTPServer: error: short send after timeout (0 < 41)
HTTPServer: error: short send after timeout (0 < 4)
HTTPServer: error: short send after timeout (0 < 29)
HTTPServer: error: short send after timeout (0 < 12)
HTTPServer: error: short send after timeout (0 < 8)
HTTPServer: error: short send after timeout (0 < 96)
HTTPServer: error: short send after timeout (0 < 34)
HTTPServer: error: short send after timeout (0 < 108)
HTTPServer: error: short send after timeout (0 < 18)
HTTPServer: error: short send after timeout (0 < 21)
HTTPServer: error: short send after timeout (0 < 21)
HTTPServer: error: short send after timeout (0 < 8)
HTTPServer: error: short send after timeout (0 < 11)
HTTPServer: error: short send after timeout (0 < 58)
HTTPServer: error: short send after timeout (0 < 8)
HTTPServer: error: short send after timeout (0 < 41)
HTTPServer: error: short send after timeout (0 < 4)
HTTPServer: error: short send after timeout (0 < 29)
HTTPServer: error: short send after timeout (0 < 12)
HTTPServer: error: short send after timeout (0 < 8)
HTTPServer: error: short send after timeout (0 < 96)
HTTPServer: error: short send after timeout (0 < 34)
HTTPServer: error: short send after timeout (0 < 107)
HTTPServer: error: short send after timeout (0 < 18)
HTTPServer: error: short send after timeout (0 < 21)
HTTPServer: error: short send after timeout (0 < 21)
HTTPServer: error: short send after timeout (0 < 8)
HTTPServer: error: short send after timeout (0 < 7)
HTTPServer: error: short send after timeout (0 < 104)
HTTPServer: error: short send after timeout (0 < 31)
HTTPServer: error: short send after timeout (0 < 106)
HTTPServer: error: short send after timeout (0 < 86)
HTTPServer: error: short send after timeout (0 < 11)

[mcspr]

Probably means client is disconnected?

Arduino/libraries/ESP8266WebServer/src/ESP8266WebServer-impl.h

Lines 612 to 616 in c2f1365

	ssize_t sent = content->sendSize(&_currentClient, content_length);
	if (sent != content_length)
	{
	DBGWS("HTTPServer: error: short send after timeout (%zu < %zu)\n", sent, content_length);
	}