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I met with errors when trying to update promgram code of the esp8266 12f.
logs as below:

[httpUpdate] Header read fin.
[httpUpdate] Server header:
[httpUpdate] - code: 200
[httpUpdate] - len: 268576
[httpUpdate] - MD5: d3e12be2a5a5167e310bac08da21f12b
[httpUpdate] ESP8266 info:
[httpUpdate] - free Space: 778240
[httpUpdate] - current Sketch Size: 268564
[httpUpdate] - current version: 1.0.03
sleep disable
[httpUpdate] Update.writeStream failed!
[httpUpdate] Update failed