B4J Question [BANANO] [SOLVED] fetch api cors error?

astronald · Jul 3, 2019

i try connect banano to jserver 0n other domain, with this code:

B4X:

    Dim response As BANanoFetchResponse
    Dim data As String
    Dim fo As BANanoFetchOptions
    fo.Initialize
    fo.Method = "POST"
    fo.Body = BANano.ToJson(CreateMap("q":"Conect","p":Array(),"l":0))
    fo.Headers = CreateMap("Content-type": "application/json; charset=UTF-8")
   
    Dim fetch As BANanoFetch
    fetch.Initialize("http://rocas.noip.us/tmx",fo)
    fetch.Then(response)
    fetch.Return(response.Text)
   
    fetch.Then(data)
        Log(data)
    fetch.End ' always end a fetch with this!

i receive this error message

Access to fetch at 'http://rocas.noip.us/tmx' from origin 'http://127.0.0.1:8887' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

in the jserver handler, i put this line

B4X:

resp.SetHeader("Access-Control-Allow-Origin","*")

but I do not succeed

Thanks for your help.

Note: jserver with postman works perfect.

Kiffi · Jul 3, 2019

just insert this:

B4X:

fo.Mode = "no-cors"

Greetings ... Peter

alwaysbusy · Jul 3, 2019

Kiffi said:
fo.Mode = "no-cors"

Also my first thought, but not sure you can use 'application/json' in this mode (I can be wrong)

astronald · Jul 3, 2019

B4X:

fo.Mode = "no-cors"

Thank but
with this line server is empty response..

astronald · Jul 3, 2019

if i disable cross origin restrictions on browser, this work properly,
but this is not right.

How should I configure the server and make the request?

Kiffi · Jul 3, 2019

i get:

Failed to load resource: the server responded with a status of 500 (java.sql.SQLException: Could not find stored procedure 'usp_Conect'.)

astronald · Jul 3, 2019

Kiffi said:
i get:
Failed to load resource: the server responded with a status of 500 (java.sql.SQLException: Could not find stored procedure 'usp_Conect'.)

Thanks peter, this is a example,
I developed procedure 'usp_Conect'
try it again

This should response 'OK'

Kiffi · Jul 3, 2019

<|>OK|*

astronald · Jul 3, 2019

Kiffi said:
<|>OK|*

Yes this is response

Kiffi · Jul 3, 2019

astronald said:
Yes this is response

ok, that seems to solve the problem. Or did I get you wrong?

astronald · Jul 3, 2019

No Peter thank's
@alwaysbusy thanks, i remove Content Header
and this worked for me

astronald · Jul 3, 2019

Final Code

B4X:

Dim response As BANanoFetchResponse
    Dim data As String
    
    Dim fo As BANanoFetchOptions
    fo.Initialize
    fo.Method = "POST"
    fo.Body = BANano.ToJson(CreateMap("q":"Conect","p":Array(),"l":0))

    
    ' list (GET is default, and we do not need extra options so we pass Null for the options)
    Dim fetch As BANanoFetch
    fetch.Initialize("http://rocas.noip.us/tmx",fo)
    fetch.Then(response)
    ' we got a response, but as the Json() method returns a Promise, we will need to process it in the next 'then' so we return it to this Fetch
    fetch.Return(response.Text)
    
    fetch.Then(data)
    ' the Json promise is resolved, lets log it...
   Log(data)
fetch.End

B4J Question [BANANO] [SOLVED] fetch api cors error?

astronald

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