[GH-ISSUE #1571] WiFiManagerParameter: length 0 not permitted as value #1341

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opened 2026-02-28 01:29:40 +03:00 by kerem · 1 comment

kerem commented

2026-02-28 01:29:40 +03:00

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Originally created by @glanch on GitHub (Mar 6, 2023).
Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/1571

Hello,
I'd like to know why a param is only shown to the user if the length is not equal 0. This would imply that a parameter can never have an empty string as a value.

The method String WiFiManager::getParamOut() which is responsible for printing parameter lists in HTTP responses tests whether the string has length 0 and interprets this as an error - whatever error is indicated by an empty string:
github.com/tzapu/WiFiManager@297123b5d7/WiFiManager.cpp (L1736)

If there is a technical reason why a parameter can't be empty, I'd really like to know before investigating solutions.

Best,
glanch

Originally created by @glanch on GitHub (Mar 6, 2023). Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/1571 Hello, I'd like to know why a param is only shown to the user if the length is not equal 0. This would imply that a parameter can never have an empty string as a value. The method `String WiFiManager::getParamOut()` which is responsible for printing parameter lists in HTTP responses tests whether the string has length 0 and interprets this as an error - whatever error is indicated by an empty string: https://github.com/tzapu/WiFiManager/blob/297123b5d7670e6c734836c13bf5ffd09b094889/WiFiManager.cpp#L1736 If there is a technical reason why a parameter can't be empty, I'd really like to know before investigating solutions. Best, glanch