运行hedera-json-rpc-relay连接Hedera Testnet配置报错如何解决？

我按照hedera-json-rpc-relay的docs/configuration.md文档指引，尝试运行RPC中继连接Hedera Testnet，配置如下：

HEDERA_NETWORK=TESTNET
OPERATOR_ID_MAIN=0.0.3996280
OPERATOR_KEY_MAIN=<redacted>
OPERATOR_ID_ETH_SENDRAWTRANSACTION=
OPERATOR_KEY_ETH_SENDRAWTRANSACTION=
CHAIN_ID=0x128
MIRROR_NODE_URL=https://testnet.mirrornode.hedera.com/
E2E_RELAY_HOST=

注：OPERATOR_ID_MAIN和OPERATOR_KEY_MAIN已从门户获取，且已在其他交易中成功使用。

文档中对HEDERA_NETWORK的说明为：

指定要连接的网络，会自动填充主节点和镜像节点端点。可选值为MAINNET、PREVIEWNET、TESTNET，或IP到节点账户ID的映射，例如{"127.0.0.1:50211":"0.0.3"}

但执行npm run start时，出现错误Error: unknown network: TESTNET，尽管文档明确说明TESTNET是允许的值。完整报错日志如下： #

> start
> npx lerna exec --scope @hashgraph/json-rpc-server -- npm run start

lerna notice cli v6.4.1
lerna info versioning independent
lerna notice filter including "@hashgraph/json-rpc-server"
lerna info filter [ '@hashgraph/json-rpc-server' ]
lerna info Executing command in 1 package: "npm run start"

> @hashgraph/json-rpc-server@0.23.0-SNAPSHOT start
> node dist/index.js

[2023-04-21 03:25:43.036 +0000] INFO (rpc-server/97941 on admins-MBP): Configurations successfully loaded
/Users/user/code/hedera/hedera-json-rpc-relay/node_modules/@hashgraph/sdk/lib/client/NodeClient.cjs:279
        throw new Error(
        ^

Error: unknown network: TESTNET
    at NodeClient._setNetworkFromName (/Users/user/code/hedera/hedera-json-rpc-relay/node_modules/@hashgraph/sdk/lib/client/NodeClient.cjs:279:15)
    at new NodeClient (/Users/user/code/hedera/hedera-json-rpc-relay/node_modules/@hashgraph/sdk/lib/client/NodeClient.cjs:94:14)
    at NodeClient.forName (/Users/user/code/hedera/hedera-json-rpc-relay/node_modules/@hashgraph/sdk/lib/client/NodeClient.cjs:164:12)
    at RelayImpl.initClient (/Users/user/code/hedera/hedera-json-rpc-relay/packages/relay/dist/lib/relay.js:69:35)
    at new RelayImpl (/Users/user/code/hedera/hedera-json-rpc-relay/packages/relay/dist/lib/relay.js:42:32)
    at Object.<anonymous> (/Users/user/code/hedera/hedera-json-rpc-relay/packages/server/dist/server.js:57:15)
    at Module._compile (node:internal/modules/cjs/loader:1254:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1308:10)
    at Module.load (node:internal/modules/cjs/loader:1117:32)
    at Module._load (node:internal/modules/cjs/loader:958:12)

Node.js v18.15.0
npm ERR! Lifecycle script `start` failed with error: 
npm ERR! Error: command failed 
npm ERR!   in workspace: @hashgraph/json-rpc-server@0.23.0-SNAPSHOT 
npm ERR!   at location: /Users/user/code/hedera/hedera-json-rpc-relay/packages/server 
lerna ERR! npm run start exited 1 in '@hashgraph/json-rpc-server'
lerna ERR! npm run start exited 1 in '@hashgraph/json-rpc-server'

这个错误源于你使用的中继版本（0.23.0-SNAPSHOT）依赖的Hedera SDK对网络名称大小写有严格要求，需使用小写的testnet而非文档中写的大写TESTNET。

方案一：修改网络名称大小写 #

修改后的完整配置如下：

HEDERA_NETWORK=testnet
OPERATOR_ID_MAIN=0.0.3996280
OPERATOR_KEY_MAIN=<redacted>
OPERATOR_ID_ETH_SENDRAWTRANSACTION=
OPERATOR_KEY_ETH_SENDRAWTRANSACTION=
CHAIN_ID=0x128
MIRROR_NODE_URL=https://testnet.mirrornode.hedera.com/
E2E_RELAY_HOST=

方案二：直接指定Testnet节点映射 #

也可以绕过名称校验，直接配置Testnet的节点IP与账户ID映射：

HEDERA_NETWORK='{"35.237.200.180:50211":"0.0.3","35.186.191.247:50211":"0.0.4","35.192.2.25:50211":"0.0.5","35.203.82.240:50211":"0.0.6","35.236.5.219:50211":"0.0.7","35.199.161.108:50211":"0.0.8","35.242.233.154:50211":"0.0.9","35.240.118.96:50211":"0.0.10","35.201.117.109:50211":"0.0.11","35.228.118.209:50211":"0.0.12"}'
OPERATOR_ID_MAIN=0.0.3996280
OPERATOR_KEY_MAIN=<redacted>
OPERATOR_ID_ETH_SENDRAWTRANSACTION=
OPERATOR_KEY_ETH_SENDRAWTRANSACTION=
CHAIN_ID=0x128
MIRROR_NODE_URL=https://testnet.mirrornode.hedera.com/
E2E_RELAY_HOST=

内容的提问来源于stack exchange，提问作者bguiz