Unexpected HTTP/1.x request: OPTIONS

[cinling]

The context

What do you wish to achieve?

1. Let Server communicate with grpc-web
   or
2. grpc-server-spring-boot-starter is compatible with http/1.x protocol

The bug

What's the problem? What's not working? What do you expect to happen.

Stacktrace and logs

io.grpc.netty.shaded.io.netty.handler.codec.http2.Http2Exception: Unexpected HTTP/1.x request: OPTIONS /net.cinling.appbill.grpc.UserProto/IsMailReg 
	at io.grpc.netty.shaded.io.netty.handler.codec.http2.Http2Exception.connectionError(Http2Exception.java:103) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at io.grpc.netty.shaded.io.netty.handler.codec.http2.Http2ConnectionHandler$PrefaceDecoder.readClientPrefaceString(Http2ConnectionHandler.java:302) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at io.grpc.netty.shaded.io.netty.handler.codec.http2.Http2ConnectionHandler$PrefaceDecoder.decode(Http2ConnectionHandler.java:239) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at io.grpc.netty.shaded.io.netty.handler.codec.http2.Http2ConnectionHandler.decode(Http2ConnectionHandler.java:438) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at io.grpc.netty.shaded.io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:501) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at io.grpc.netty.shaded.io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:440) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at io.grpc.netty.shaded.io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at io.grpc.netty.shaded.io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at io.grpc.netty.shaded.io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at io.grpc.netty.shaded.io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at io.grpc.netty.shaded.io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at io.grpc.netty.shaded.io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at io.grpc.netty.shaded.io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[grpc-netty-shaded-1.37.0.jar:1.37.0]
	at java.base/java.lang.Thread.run(Thread.java:831) ~[na:na]

Steps to Reproduce

Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

The application's environment

Which versions do you use?

• Spring (boot):2.5.4
• grpc-java:1.40.1
• grpc-spring-boot-starter:2.12.0.RELEASE
• java: version + architecture (64bit?). OpenJDK 64-Bit Server VM (build 16.0.2+7-67, mixed mode, sharing)
• Other relevant libraries...
• grpc Client[node.js]：
• @ngx-grpc/* 2.3.0
• google-protobuf 3.17.3
• grpc-web 1.2.1

Additional context

• Did it ever work before?
  NO
• Do you have a demo?
  NO

[ST-DDT]

Please provide steps to reproduce the error otherwise we cannot help you.

A quick google search revealed the following issue: grpc/grpc-web#432
AFAICT grpc-java does not support HTTP/1.x requests, if that's the case there is nothing we can do in this regard other than: #207 (far future)

[cinling]

I tried to use nginx as an intermediate proxy, now it can run

[Edwin-Xu]

m

[eum2o]

@cinling can you please elaborate on this a little?

How did you configure Nginx? I only know that you can forward certain calls to arbitrary destinations. But I don't get how you use Nginx to forward HTTP/1.1 (probably JSON?) requests to an HTTP/2 gRPC endpoint.

[cinling]

这是来自QQ邮箱的假期自动回复邮件。   我也许不在，但我回尽快回复你的

[wbartussek]

I'm having exactly the same issue as described by cinling above. Unfortunately cinling's answer being on vacation is funny but not very helpful. Has anybody a solution that is a bit more explicit than cinling's answer "I tried to use nginx as an intermediate proxy, now it can run"?

[cinling]

这是来自QQ邮箱的假期自动回复邮件。   我也许不在，但我回尽快回复你的