InvalidHeader error for creating working order through trading_ig api

[wki]

Hi, trying to create a new working order with a trigger level going through the Python trading_ig API.

currencyCode = 'GBP'
direction = 'BUY'
epic = 'CS.D.BITCOIN.TODAY.IP'
expiry = 'DFB'
forceOpen = True
guaranteedStop = True
level = str(11450)
limitDistance = str(150)
timeInForce='GOOD_TILL_CANCELLED'
limitLevel = None
orderType = 'LIMIT'
quoteId = None
size = str(1)
stopDistance = str(150)
stopLevel = None
goodTillDate = str(datetime(year = 2020, month = 9, day = 3, hour = 18, minute = 0))

response = ig_service.create_working_order(currencyCode, direction, epic,
        expiry, guaranteedStop, level, size, timeInForce, orderType, limitDistance, limitLevel, 
        stopDistance, stopLevel, goodTillDate, quoteId, forceOpen, None)

However, getting a "InvalidHeader: Value for header {VERSION: 2} must be of type str or bytes, not <class 'int'>" error.  Tried various permutations on the string values, have a feeling that the problem lies elsewhere (pebkac most likely 😉 ). 

 

[jlz]

You have two parameters that conflict with each other, "timeInForce" and "goodTillDate".

Change the "orderType" parameter to "type"

I moved what I had in C# to Python in this repo, so it is easier to point things out:

https://github.com/oneangrytrader/brokerapiclients/blob/master/IG.Python.Api.Client/tests/TestIgClientWorkingOrders.py

Within the test you can see the parameters that I am using. The test uses GBPUSD with a limit and a stop of 100 away from the initial level.

 

 

[jlz]

I just realised that the "orderType"is a variable and is not a parameter, ignore that line about "type"  , the rest still applies 

[wki]

Thanks again for your help @jlzbut still struggling. I reverted back to the basic create_open_position to test the connection, and start again from there, etc.  So this works: 

response = ig_service.create_open_position(
    currency_code='GBP', 
    direction='BUY', 
    epic='CS.D.BITCOIN.TODAY.IP',
    expiry='DFB', 
    force_open=True, 
    guaranteed_stop=False, 
    level=None, 
    limit_distance='150', 
    limit_level=None, 
    order_type='MARKET', 
    quote_id=None, 
    size='1', 
    stop_distance='150', 
    stop_level=None,
    trailing_stop=False, 
    trailing_stop_increment=None)

But this does not (same InvalidHeader error as original post):

response = ig_service.create_working_order(
    currency_code='GBP', 
    direction='BUY', 
    epic='CS.D.BITCOIN.TODAY.IP',
    expiry='DFB', 
    force_open=True,
    time_in_force = 'GOOD_TILL_CANCELLED',
    good_till_date=None,
    guaranteed_stop=False, 
    level='10800', 
    limit_distance='150', 
    limit_level=None, 
    order_type='LIMIT', 
    deal_reference=None, 
    size='1', 
    stop_distance='150', 
    stop_level=None)

[jlz]

I always develop my own libraries so I don't have to deal with others' bugs.

Where did you get that library? Let me clone it and see how the headers are being set up there.

Is there any github I can clone to test it?

[wki]

I can see why you do that 😉. Thanks for your help. Here is the repo for the trading_ig api:

https://github.com/ig-python/ig-markets-api-python-library/blob/master/trading_ig/rest.py

[wki]

I got it! It was a pesky little VERSION= 2 instead of VERSION = "2" under the """Updates an OTC working order""". I'll log a bug. Seems to be working now, thanks!

[jlz]

ahh, that is why I don´t like weak-typed languages. C# would have spotted that error in the fist run.

Also looking at the repo you sent, it seems that the streaming API has many errors and there are pending pull requests to be completed. The C# library works without any problem so you might want to have a look at it and give up Python.

[wki]

That's great feedback, cheers. Will struggle to find the time to move over from Python to C# but will keep that in mind, especially if the wheels keep coming off with the Python libraries.