MultiChain Developer Q&A - Recent questions tagged http

Sporadically receiving connection error when doing JSON RPC requests

Wed, 23 Oct 2019 15:42:10 +0000

Hello,

I made a web application which sends JSON RPC requests to a multichain node on the same server (localhost), the requests work correctly most of the time, except that in about 4% of the cases the request fails and the only error I have available is what the standard .net webrequest library tells me: "Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host." which should mean that for some reason multichain is closing down the connection while in the process of sending back a response.

I've been trying to debug this for a while without success, it may happen with any JSON RPC request and generally happens when there a bunch of requests in a short time (right now I'm doing tests with 1 second delay and it happens around the tenth consecutive request).

I don't know what's happening and how to debug it since it seems to be a problem on the side of multichain and one that happens only a small percentage of the time.

I tested on multichain community 2.0.3 but I had this happen even on 2.0.2.

What can I do to further investigate this situation?
Any idea on why it could be happening?

Documentation/Example sending JSON-RPC requests

Tue, 21 May 2019 21:18:20 +0000

Hi,

is there a documenation or example on how to send JSON-RPC requests to multichain?

Basically, the idea is to use JSON-RPC over HTTP instead of the multichain-cli.

Thanks in advance.

Web Demo Error: HTTP 0

Tue, 17 Apr 2018 12:55:26 +0000

Hi all,

Im trying to connect the webdemo to my main node. I currenty have the following config:

default.name=Default

default.rpchost=10.51.120.68
default.rpcport=4252
default.rpcuser=multichainrpc
default.rpcpassword=xxx
default.rpcallowip=10.51.120.86

When I start the node it says connect to multichaind chain1@10.51.120.86:4253

Params.dat mentions 4252 as default rpc port.

But Im still getting the error when statrting the web demo and I cant find and logs or clearer issues.

Is it also correct that every time that I start the node the ip of the node changes? Does that mean I have the reconnect every node every time I start it again? That doesnt seem likely.

Can anyone help me fix this issue?

Thanks!

Error: HTTP 0 on my local server

Wed, 27 Dec 2017 11:36:11 +0000

how can I solve Error: HTTP 0 on my local Different-2. it is running on local machine.

my config.txt looking like that.

default.rpchost=127.0.0.1            # IP address of MultiChain node
default.rpcport=4782                  # usually default-rpc-port from params.dat
default.rpcuser=multichainrpc          # username for RPC from multichain.conf
default.rpcpassword=3xD5RuCuzu7ySMcwcp1nD7e9ddRf3oe7sFYwbsBTEtVg                   # password for RPC from multichain.conf

another.name=blockchain
another.rpchost=192.168.2.23
another.rpcport=8385
another.rpcuser=multichainrpc
another.rpcpassword=7gBiqCpv6cFy5QM51EDkZq5FVJ6b3PGUXCdak2L6zBXq

its running only system.

how can i run it for another server

Can I access multichain using REST calls?

Wed, 17 May 2017 18:06:46 +0000

Hi,

I have an application written in Java.

I want to connect with multichain using REST (HTTP) calls. Is this possible?

If yes, please share the tutorial link.

Regards

Anuj

API no longer responds after 3 to 5 requests - Bug

Thu, 27 Apr 2017 14:55:21 +0000

Hi Multichain team,

I think I just found a problem with the JSON RPC API.

I set up a Multichain in Docker with two nodes, I'm working on a project where I need to make some call to the API, the purpose is to perform operations on the chain. I noticed that after 3 to 5 calls (mostly 5), my application just freezes.

I tried with different calls (publishfrom, getmultibalances, even getinfo) and the problem stay the same.

To make it clear, I think it comes from the fact that clients keep the TCP connection open and there is no way to establish further connections.

When it happens, everything is frozen, no more response from multichain-cli, no more access to web demo or anything.

Can you help me about this ? Thank you

(I have a small console application available to reproduce the bug if you want)

Multichain Demo - Error: HTTP 0

Tue, 20 Dec 2016 03:04:28 +0000

Here is my testing site: http://chain.manjago.com/demo/

Below is my config.txt for Multichain Demo

default.name=Default # name to display in the web interface
default.rpchost=172.31.11.xxx # IP address of MultiChain node
default.rpcport=4799 # see rpc-port from chain parameters
default.rpcuser=multichainrpc # username for RPC from multichain.conf
default.rpcpassword=xxxxxxxxxxxx # password for RPC from multichain.conf

# You can configure support for other nodes using a word other than 'default':
#
backup.name=Backup # name to display in the web interface
backup.rpchost=172.31.13.xx # IP address of MultiChain node
backup.rpcport=4799 # see rpc-port from chain parameters
backup.rpcuser=multichainrpc # username for RPC from multichain.conf
backup.rpcpassword=xxxxxxxxxxxx # password for RPC from multichain.conf

I have changed the multichain.conf on ./multichain/chain3 to the following

rpcuser=multichainrpc
rpcpassword=xxxxxxxxxxxx
rpcallowip=172.31.18.xx (Private IP address of the Web Server)

I have no idea why it is not working...

sample for json rpc

Wed, 11 Nov 2015 17:42:38 +0000

hello,

can someone pls provide a sample to use the json-rpc thro http, a curl would be best, i am not sure whats the http port and where to find it in the configuration file

for eg, I am hoping there is some thing like

> curl -v <host>:<port>/<path> -H 'Content-Type: application/json' -d '{"method":"getinfo"}'

but i am not sure about what the default values are,

Thanks