Unable to broadcast TX via tendermint or REST API

[rami-dabain]

Summary of Bug

Tendermint response:
curl -X POST https://lcd-sentinel.cosmostation.io/txs -d testtx.json {"error":"this transaction cannot be broadcasted via legacy REST endpoints, because it does not support Amino serialization. Please either use CLI, gRPC, gRPC-gateway, or directly query the Tendermint RPC endpoint to broadcast this transaction. The new REST endpoint (via gRPC-gateway) is POST /cosmos/tx/v1beta1/txs. Please also see the REST endpoints migration guide at

REST response:
curl -X POST https://lcd-sentinel.cosmostation.io/cosmos/tx/v1beta1/txs -d testtx.json { "code": 3, "message": "invalid character 'e' in literal true (expecting 'r')", "details": [ ] }

this is the same response no matter what's inside that file (even if it's empty)

Version

sentinel-hub fa7cd3c7d5f427308d8a837a18b951482ce5c9e2 0.8.3

Steps to Reproduce

check summary

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[alexanderbez]

Can you please post the signed tx file that you're broadcasting?

[rami-dabain]

sure:

{"body":{"messages":[],"memo":"","timeout_height":"0","extension_options":[],"non_critical_extension_options":[]},"auth_info":{"signer_infos":[{"public_key":{"@type":"/cosmos.crypto.secp256k1.PubKey","key":"A/pYmsKYXcdQD7mDH39lhy54IlOgfYgf97AdJJsmbaUN"},"mode_info":{"single":{"mode":"SIGN_MODE_DIRECT"}},"sequence":"0"}],"fee":{"amount":[],"gas_limit":"0","payer":"","granter":""}},"signatures":["ojkzNrNynSwUsJWlDaq18oM/sYpPQVAfQvvkGwOrLoZTI+buZMLkulTXpA/6UNffSffyb/pDq4PeaIV2dPe/5w=="]}

this was generated using the cosmos SDK (with golang) as per the doc @ https://docs.cosmos.network/master/run-node/txs.html#programmatically-with-go

this message is invalid in the first place (for example it's using messages where the server is expecting message.

I even tried to build a transaction manually, same results.
in fact you get the same error no matter what you post to the endpoint, which suggests the error is from somewhere within. i wasn't able to pinpoint it

[alexanderbez]

The file contents are incorrect -- it doesn't contain any messages.

[rami-dabain]

Yes, this is what i stated in the previous message.

However:
1 - Returning code-related error instead of a user-friendly message is a security red-flag even in open source projects
2 - When I tested a valid signed-tx packet it went though GRPC but not through REST (original issue)
3- You will get the same error message no matter the payload, you could give it a try yourself with any file, even an empty one:
curl -X POST https://lcd-sentinel.cosmostation.io/cosmos/tx/v1beta1/txs -d testtx.json

the fact that the error message remains the same even for empty files indicated that the error is not related to the contents of the file. I have tried to debug the issue myself but the code doesn't have enough comments and is difficult to debug without having an up-to-date documentation

[alexanderbez]

(1) It returns an error code in addition to a messsage.
(2) The REST API endpoint is deprecated and will not work, unless you mean the gRPC HTTP Gateway route?
(3) I doubt that as we have tests and clients using the gRPC Gateway API endpoint to submits txs (e.g. the Keplr wallet). There must be something wrong with your payload?

[rami-dabain]

Hi Alexander,
as for 1st point the error code is not clear (and it's the same even for valid TXes that went though using the cli)
As for 2nd point I have provided a URL multiple times which would have answered your question.

Thanks for taking some time looking into this, the lack of up-to-date documentation is frustrating and it seems that you are not reading the whole issue anyway, so I'll close this issue and "again" try examples from your official documentation @ https://docs.cosmos.network/master/run-node/txs.html#programmatically-with-go