Mathew Harman 3c59f9e682 fix(esp_http_client): fix error return when set_header has value==NULL ...

Prior to v5.4, headers could be deleted from an HTTP client by calling
esp_http_client_set_header("Header", NULL). This pattern is used by
esp_http_client_set_post_field(NULL, 0), which is the only API usage
that will delete the request body in a persistent connection scenario.

2025-04-04 06:32:16 -04:00

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