UnityWebRequest HTTP POST to Cloud Functions for Firebase - firebase

Question

I'm Having some trouble making an POST Http Request to my firebase cloud-functions project from Unity3D game engine.
I keep getting a code 400 response, and in the firebase console I can see the following error:
Error: invalid json at parse
I don't really have a lot of knowledge about Http requests, and after quite some time of trying to find out a solution I'd like to ask for help.
Here is the client code:
public void RateLevel(string guid, int rating)
{
RateLevelRequest rlr = new RateLevelRequest (guid, rating.ToString());
string body = rlr.ToJson ();
UnityWebRequest www = UnityWebRequest.Post("myurl", body);
www.SetRequestHeader ("Content-Type", "application/json");
StartCoroutine (MakeRequest (www));
}
/* * * * * * * * * * * * * * * * * * *
* AUXILIAR CLASS FOR HTTP REQUESTS *
* * * * * * * * * * * * * * * * * * */
[System.Serializable]
public class RateLevelRequest
{
public string guid;
public string rating;
public RateLevelRequest(string _guid, string _rating)
{
guid = _guid;
rating = _rating;
}
public string ToJson()
{
string json = JsonUtility.ToJson (this);
Debug.Log ("RateLevelRequest Json: " + json);
return json;
}
}
I can guarantee that the json is well formed, with values like this.
{"guid":"fake-guid","rating":"-1"}
And here is my current deployed function in firebase-functions.
exports.rate_level = functions.https.onRequest((req, res) => {
if(req.method === 'POST')
{
console.log('guid: ' + req.body.guid);
console.log('rating: ' + req.body.rating);
console.log('invented var: ' + req.body.myinvention);
if(req.body.guid && req.body.rating &&
(req.body.rating == 1 || req.body.rating == -1))
{
res.status(200).send('You are doing a post request with the right fields and values');
}
else
{
res.status(403).send('Required Fields are not Defined!')
}
}
else
{
res.status(403).send('Wrong Request Method!');
}
});
Has anyone tried this and succeeded before?
Thanks in advance!

Answer 1

Ok I found the answer in an excellent blog entry.
I really don't know what was wrong, but I instead replaced my code to the one indicated in the article mentioned above, which works. I'll post it for the rest of you having issues.
public void RateLevel(string guid, int rating)
{
RateLevelRequest rlr = new RateLevelRequest (guid, rating.ToString());
string body = rlr.ToJson ();
byte[] bodyRaw = new System.Text.UTF8Encoding ().GetBytes (body);
UnityWebRequest www = new UnityWebRequest("myurl", UnityWebRequest.kHttpVerbPOST);
www.uploadHandler = (UploadHandler)new UploadHandlerRaw (bodyRaw);
www.downloadHandler = (DownloadHandler)new DownloadHandlerBuffer();
www.SetRequestHeader ("Content-Type", "application/json");
StartCoroutine (MakeRequest (www));
}
Best!