Content-type headers automatically change on PUT

[LilMoonish]

If I use this function with FormData as the data automatically changes Content-type headers to
Content-Type: multipart/form-data; boundary=----WebKitFormBoundarygUCRrzJieLA2q33y
ignoring my custom header.

If i use the function with data empty it sends properly my custom header. I have a createProduct function using POST with the same FormData and header and it works great. I don't know what I'm doing wrong :(

This is my code:

static updateProduct(data, id_product) { const url = ${API_BASE_URL}+'/producto/'+${id_product}; return axios.put(url, data, { headers: {'Content-Type': 'application/json'}; }); }

[chinesedfan]

Duplicate of #1603.