'Reallocating large String(... -> ...)' warning when using WebServer
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Description
Hi,
since PR #8821 I get this output from ESP8266WebServer:
```
[String] 'Content-Ty ... ires: -1
': Reallocating large String(140 -> 162 bytes)
```
It's from this line
https://github.com/esp8266/Arduino/blob/be02af0504869e2bf119a013fe8fd6cf5ed8e411/libraries/ESP8266WebServer/src/ESP8266WebServer-impl.h#L433
if `sendHeader()` is used more than once. Like here:
https://github.com/khoih-prog/ESP_WiFiManager_Lite/blob/085afdbd7ccfb7e46b1ed9f1cf5c50be29cc3223/src/ESP_WiFiManager_Lite.h#L2771
Is there something we can do against it?
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