[ERR] URL Remix IDE instance has to be provided 解决办法

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解决Remix Web IDE 无法本地连接的问题

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问题描述

安装完remixd和remix-ide后，参考网上教程，准备将文件夹共享出来，在remix 浏览器IDE中进行本地连接，输入一下命令

 remixd -s E:\share_file

结果报错

[ERR] URL Remix IDE instance has to be provided

本以为不是什么大问题，准备在网上搜一下，竟然没有找到一篇文章讲这个问题，不知道是别人都没有遇到还是怎么回事，于是去谷歌了一下，也只有一篇帖子，有图为证

而且第一篇帖子里说是要“update package.json”，完全不是这回事。

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问题解决

在网上找到了各种相关帖子，发现没有一个能够解决问题，那就去看看源代码吧。
找到了GitHub上remixd的介绍文档，如下

Usage: remixd -s <shared folder>

  Provide a two-way connection between the local computer and Remix IDE.
  
  Options:
    -s, --shared-folder <path>            Folder to share with Remix IDE
    -m, --mist                            start mist
    -g, --geth                            start geth
    -p, --dev-path <dev-path>             Folder used by mist/geth to start the development instance
    -f, --frontend <front-end>            Folder that should be served by remixd
    -p, --frontend-port <front-end-port>  Http port used by the frontend (default 8082)
    -a, --auto-mine                       mine pending transactions
    -r, --rpc <cors-domains>              start rpc server. Values are CORS domain
    -rp, --rpc-port                       rpc server port (default 8545)
    -h, --help                            output usage information

除了 -s 共享文件夹的命令外，其他好像都没有啥关系，抱着死马当活马医的态度，试了试 -h 命令

PS E:\share_file> remixd -h
Usage: remixd -s <shared folder>

Provide a two-way connection between the local computer and Remix IDE

Options:
  --remix-ide  <url>                    URL of remix instance allowed to connect to this web sockect connection
  -s, --shared-folder <path>            Folder to share with Remix IDE
  --read-only                           Treat shared folder as read-only (experimental)
  --vyper                               Run a local vyper compiler
  -m, --mist                            start mist
  -g, --geth                            start geth
  -p, --dev-path <dev-path>             Folder used by mist/geth to start the development instance
  -f, --frontend <front-end>            Folder that should be served by remixd
  -p, --frontend-port <front-end-port>  Http port used by the frontend (default 8082)
  -a, --auto-mine                       mine pending transactions
  -r, --rpc <cors-domains>              start rpc server. Values are CORS domain
  -rp, --rpc-port                       rpc server port (default 8545)
  --profiler                            start profiler service
  -h, --help                            output usage information

Example:

    remixd --dev-path /home/devchains/chain1 --mist --geth --frontend /home/frontend --frontend-port 8084 --auto-mine

出来上面的内容，总算看到了跟 ** URL of remix instance**有关的命令，继续试呗

PS E:\share_file> remixd --remix-ide 127.0.0.1:8080
[WARN] You may now only use IDE at 127.0.0.1:8080 to connect to that instance

提示说只能在127.0.0.1:8080里使用IDE去连接这个实例，反正没有报错，那就继续，在终端里启动remix IDE。

PS E:\share_file> remix-ide

在浏览器里输入127.0.0.1:8080后就打开了remix IDE，试试本地连接，成功！！！
power shell里面也显示连接被接受

PS E:\share_file> remix-ide
setup notifications for E:\share_file
Starting Remix IDE at http://localhost:8080 and sharing E:\share_file
Tue Oct 30 2018 21:16:31 GMT+0800 (中国标准时间) Remixd is listening on
Tue Oct 30 2018 21:16:37 GMT+0800 (中国标准时间) Connection accepted.

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其他问题

本来到此就应该结束了，但是我之前用过localhost:8080来打开remix IDE本地连接，于是想看看换个URL会不会成功。

PS E:\share_file> remixd --remix-ide "localhost:8080"
[WARN] You may now only use IDE at localhost:8080 to connect to that instance

在浏览器中打开remix IDE，本地连接失败！

然后，我又试了试官网地址

PS E:\share_file> remixd --remix-ide http://remix.ethereum.org/
[WARN] You may now only use IDE at http://remix.ethereum.org/ to connect to that instance

直接通过官网连接打开remix IDE，结果本地连接还是失败！

PS E:\share_file> remix-ide
setup notifications for E:\share_file
Starting Remix IDE at http://localhost:8080 and sharing E:\share_file
Tue Oct 30 2018 20:40:53 GMT+0800 (中国标准时间) Remixd is listening on 127.0.0.1:65520
Tue Oct 30 2018 20:41:30 GMT+0800 (中国标准时间) Connection from origin http://localhost:8080 rejected.
Tue Oct 30 2018 21:10:08 GMT+0800 (中国标准时间) Connection from origin http://localhost:8080 rejected.
^C终止批处理操作吗(Y/N)? y
PS E:\share_file> remix-ide
setup notifications for E:\share_file
Starting Remix IDE at http://localhost:8080 and sharing E:\share_file
Tue Oct 30 2018 20:38:43 GMT+0800 (中国标准时间) Remixd is listening on 127.0.0.1:65520
Tue Oct 30 2018 20:38:57 GMT+0800 (中国标准时间) Connection from origin http://localhost:8080 rejected.
Tue Oct 30 2018 20:39:06 GMT+0800 (中国标准时间) Connection from origin http://localhost:8080 rejected.
Tue Oct 30 2018 20:39:09 GMT+0800 (中国标准时间) Connection from origin http://localhost:8080 rejected.
Tue Oct 30 2018 20:39:18 GMT+0800 (中国标准时间) Connection from origin http://localhost:8080 rejected.
Tue Oct 30 2018 20:39:27 GMT+0800 (中国标准时间) Connection from origin http://localhost:8080 rejected.

其他两个地址的连接请求都失败了，不知道与Remixd 的监听地址有没有关系，期待大家的解答！