Dio Error : Http Status Error Code [ 405 ] Flutter - flutter

Question

I am getting HTTP status error code 405 on sending post requests from the real devices but it's working inside the postman.
The URL is: https://amapp.adtestbed.com/api/post-survey
The following is the form data I am using
FormData formData = FormData.fromMap({
'user_id': id,
'is_collection':
jobDetailsResponseModel.jobData.jobStatus == '8' ? 1 : 0,
'job_id': jobDetailsResponseModel.jobData.id,
'job_no': bookingIdController.text.toString(),
'sender_name': senderNameController.text.toString(),
'reciever_name': recieverNameController.text.toString(),
'sender_phone': senderPhoneController.text.toString(),
'reciever_phone': recieverPhoneController.text.toString(),
'sender_address': senderAddressController.text.toString(),
'reciever_address': recieverAddressController.text.toString(),
'sender_signature_data':
"data:image/jpeg;base64," + base64Imagesendersign,
'receiver_signature_data':
"data:image/jpeg;base64," + base64Imagerecieversign,
'location': currentLocation,
'images[]': uploadimages,
'maked[]': makedlist,
'model[]': modallist,
'rego[]': regolist,
'speedo[]': speedolist,
'is_drivable[]': isdrivablelist,
'goods_inside[]': goodsinsidelist,
'external_condition[]': externalconditionlist,
'interior_condition[]': internalconditionlist,
'survey_image[]': surveyimagelist,
'comments[]': commentlist
});
Here images field is a multipart form list.
And doing requests as follows
final response = await Dio().request(
'https://amapp.adtestbed.com/api/post-survey',
data: formData,
options: Options(
headers: {
"Accept": "application/json",
},
method: 'POST',
),
);
also used the following code to check but still not working
final response = await Dio().post(
'https://amapp.adtestbed.com/api/post-survey',
data: formData,
options: Options(
// headers: {
// // "Accept": "application/json",
// // 'Content-Type': 'application/x-www-form-urlencoded'
// },
method: 'POST',
),
);
When I am sending the form without an images field then it's submitting perfectly and giving 200 status but when I am sending it's with an images field that contains a multipart form list then it's returning 405 status code. End giving the error like the get method not supported only support post method. I also checked the backend code but no error from that's side because it's giving an error before sending the request. I also checked if there were some null data that created errors but not a single field is null.
But when I am doing both cases in postman then it's working fine.
This is the postman link:
https://drive.google.com/file/d/1hTmDC2aQ7vTMxSnzwaeRqd9gv7UbPWhR/view?usp=sharing
These are some images of the postman

Answer 1

https://stackoverflow.com/a/64235806/11623001
Check this out I had a similar issue too before, and I also noticed that you are not adding your authorization token to your header which may explain why you are getting 405 which would mean you can't have access.
I tried to recreate your issue on my end but the authorization token is expired, I'm getting a 401, but here is the code:
void postSome() async {
String base64 =
//This base64 is shortened "data:image/png;base64,...+WZm/et53efvWO6Tuc6rH7kUXy1lxs+/61t7dMg6VAvURAAAAQHMQogDAbE6dlLXtft/F3cuvkJNbetbn7VWrpUUX+mvEtqdHvgAAAABoOf8P3x1uDPELl4UAAAAASUVORK5CYII=";
FormData formData = FormData.fromMap({
'user_id': 139,
'is_collection': "1" == '8' ? 1 : 0,
'job_id': "248",
'job_no': "60036JL#1",
'sender_name': "test",
'reciever_name': "test",
'sender_phone': "1234567890",
'reciever_phone': "1234567890",
'sender_address': "test",
'reciever_address': "test",
'sender_signature_data':
base64,
'receiver_signature_data': base64,
'location': "32, Gopal Nagar, Om Nagar, Gopal Nagar Society, Parvat Patiya, Surat, Gujarat 395010, India\n",
'images[]': "/D:/App/Logicwind/GitLAb/whiteboard-digitization/test_images/w11.jpg",
'maked[]': "test",
'model[]': "test",
'rego[]': "test",
'speedo[]': "123",
'is_drivable[]': "1",
'goods_inside[]': "1",
'external_condition[]': "3",
'interior_condition[]': "3",
'survey_image[]': base64,
'comments[]': "test"
});
final response = await Dio().request(
'https://amapp.adtestbed.com/api/post-survey',
data: formData,
options: Options(
headers: {
'Accept': "application/json",
'Authorization': 'Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiJ9.eyJhdWQiOiIzIiwianRpIjoiNTlkNzNlZjE4YzcxNGJjMWM1ZjE0ZGQxOWE1OWZmNmQ1YjVhNDViNDIwNzlkODY4ZmJkOGRmNjJlOGM4MDQzNmVjYmIxZjc4MjM5MmZiOGIiLCJpYXQiOjE2MjgxNzY5NTAsIm5iZiI6MTYyODE3Njk1MCwiZXhwIjoxNjU5NzEyOTUwLCJzdWIiOiI0NiIsInNjb3BlcyI6W119.lfnzUvq_LwYtBUQ-t6S_mKXEoM6er6ZzCuTUoHnqz9wwrdLOcu6x9CEixqMRvI-RWtSoiMO5KCYZsgagayGW5slYk6zAAa0V5fCjkRipqqus6mXe6nowtcXs_2V9ucjVoH4Evkb9lFBlE1rlpxKgcGXTcx4UgQs8kjJ5Wm4A8omedza_hUQPN9KUAfhhBDeL9hq-DkC7QbLu_YxnG5g-AETKhbJu8T4HWKqkh9NKGbNlvs1oi_nD81F1w8uSteY-UOgDJyUoGJxzoD6xmEv3J4mkrdr1ZbG88EzTyk3zngwBp9eWcLHhMS2psxArOnOnWusweJJ5uZiWiu2VIL7fWmV5b6G4OCvvkba5eXmw8iAvACACuCGQtOcGdN_euUgyfM9z9a8QbK8M2I-ux4GGY0ejCamFEJZCTwyBCxmLIrP4XjQoeL71WT1YBOgSZwDjA6qrAfL_fLwbEYQYbLIF8fLUmDOWRKBIaJLSVNG2x0Gl5LLXTiTZAzRRtJlSxZ4-Vid4hQJX39lohp-47XPAxvHnNTxiLw_aAG3SruFZ_rtdX4xnNbV3hSI825CD5dBeQC5iE-hiLXDWDXelM_q2fSD1rez62XQZGp1KfvlwowxAWgIghTfSH_E52h6mdoHEo9q73UJNYDz_F9Sj8EOfY3VWtmN6HMmcs4HZht36qX4',
},
method: 'POST',
),
);
print(response.statusCode);
}

Answer 2

It looks like below two fields are files not a form data.
'sender_signature_data': "data:image/jpeg;base64," + base64Imagesendersign
'receiver_signature_data': "data:image/jpeg;base64," + base64Imagerecieversign
You should add those as file fields like this
"sender_signature_data": await MultipartFile.fromFile(sender_signature_path,
filename: fileName, contentType: MediaType(mimee, type))
}),
"receiver_signature_data":await MultipartFile.fromFile(reciever_signature_path,
filename: fileName, contentType: MediaType(mimee, type))
})