ESP32 Forum

Posted: **Sat Oct 27, 2018 6:57 pm**

Few days ago my code has been working just fine, but today i am having very strange behavior. I am trying to send base64 data with Content-Type set to image/jpeg but my browser is receiving 2 headers with key Content-Type (image/jpeg and text/html). This is my code to set header:

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	httpd_resp_set_hdr(req, "Content-Type", "image/jpeg");
	httpd_resp_send(req, (const char*)data->base64_data, data->base64_size);

Browser response headers:

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HTTP/1.1 200 OK
Content-Type: text/html
Content-Length: 20480
Content-Type: image/jpeg

Just checked and for text/json i am also getting two Content-Type headers:

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Content-Length: 27168
Content-Type: text/html
Content-Type: text/json

Posted: **Sat Oct 27, 2018 8:42 pm**

Using

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httpd_resp_set_type

to set content type fixes my issue, but this looks like small bug.

Posted: **Mon Oct 29, 2018 5:29 am**

As per the API reference documentation, `httpd_resp_set_hdr()` must be used only for setting additional headers other than `Content-Type` and `Content-Length`. The `Content-Type` field must be set using only `httpd_resp_set_type()`, else it will cause unwanted behavior.

I will update the API reference to make this more clear, so as to not cause confusion and inconvenience for the users in future.

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