I need to send a post request from Flutter to activate a Cloud Run service.
The service app code for the POST method in the back end is as follow:
app = Flask(__name__)
@app.route("/", methods=["POST"])
def index():
print("I AM IN INDEX")
print("1")
print(type(request))
print("2")
envelope = request.get_json()
print("3")
where the several prints are meant to understand where the flow fails.
In the front end, if I use the following script:
var http_request = jsonEncode({
"param1": "abc",
"param2": "xyz"
});
var uri = 'https://service-pphjhss-ez.a.run.app';
final res = await http.post(
Uri.parse(uri),
headers: {'Content-Type': 'application/json'},
body: http_request);
In the front end I get an Error: XMLHttpRequest error.
In the back end, a message OPTIONS 200 is generated in the Cloud Run logs (which seems correct to me). The problem is that the control flow does not enter in the "def index():" meaning that the message "I AM IN INDEX" is nto printed out in the logs.
If I remove headers: {'Content-Type': 'application/json'} in the request, in the frontend, the flow gets into the index function but the flow stops in line 8, in the get_json().
Observe that
export URL=https://service-pphjhss-ez.a.run.app
curl -X POST -H "content-type: application/json" \
-d '{
"param1": "abc",
"param2": "xyz"
)' -w "\n" $URL
works fine!
So it is obviously a problem in the request in Flutter. But I cannot understand what;'s wrong with it
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