3.1 esp_http_client inserting headers into POST data.

[BrettG]

Hi, I am using esp_http_client to send large chunks of data. We are having an issue where, very infrequently, the HTTP headers, set for the POST via esp_http_client_set_header, are being injected into the middle of the POST data.

The data is a chunk of an image being sent as a 12800 length null terminated byte string.

I thought it may be the data being treated as a string and somehow injecting the header string into the data if there was a '%' character present. But the issue did not subside after sanitizing the data of any '%' characters before handing it off to esp_http_client_set_post_field.

I have attached a snippet of the data containing the header for reference.

example snippet.txt

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Are there other special characters we should be removing from the by string, or any flags to better handle what data that we are trying to send. Or is esp_http_client not built to send raw byte data?

Any help is greatly appreciate,
- Brett