How to assign a mimetype to document being created using REST API? (Alfresco 5.2)

[mikeitexpert]

hi,

I am wondering if there is anyway we can set/assign the content-mime type of a document being created using REST API.

I use the below this rest api  and I need to be able to set mimetype directly when the document is being created. 

Is that possible?

I did a few try and errors it seems that mimetype is determined based on the extension given to the name property passed to the api.

So if I for example use the below as the json post parameter, the mimetype becomes application/pdf but 

{
"name": "filename.pdf",
"nodeType": "string",

}

if use the below, the mimetype becomes applicaiton/image. 

{
"name": "filename.png",
"nodeType": "string",

}

Please advise if that can be set using REST API.

Thank you,

[angelborroy]

You cannot set mime type when uploading, as it's autodetected. 

If you find any case where this detection process fails, you can modify mime type after uploading the content.

[4535992]

Can you give a example for this ?

I have tried this:

FormData data = new FormData();
data.addFieldData("prop_mimetype", mimetype, true);
Item itemMimetype = new Item("node", nodeRef.toString());
NodeRef nodeRefFoundedUpdated = (NodeRef)formService.saveForm(itemMimetype, data);

and this:

ContentWriter contentWriter = contentService.getWriter(nodeRef, ContentModel.PROP_CONTENT, true);
if(contentWriter != null) {
	contentWriter.setMimetype(mimetype);
}

but is not working is still a "application/octet-stream" value on alfresco share