Only this
e := echo.New()
e.Use(middleware.LoggerWithConfig(middleware.LoggerConfig{
does that request have
Content-Length header?
4 replies
Hi! I'm using echo with oapi validate middleware to check incoming request parameters against a regex in an OpenApi specification file. When a parameter does not match the regex a message it's shown with the correct regex for that parameter. The problem I'm having is that the slashes in the regex string are escaped multiple times. I think that when opai_validate generates the error message it prints the regex with
%q so the single slash is escaped there. And then when echo prints the message the same thing happens and each slash is escaped again, making a single slash into four. Does anyone have an idea on how to deal with this?
Set your debugger breakpoint here https://github.com/deepmap/oapi-codegen/blob/d819e1dea68f9bf0118ab2138e1bb57c8d3de2f9/pkg/middleware/oapi_validate.go#L103 and check what that e.reason value is.
and maybe another breakpoint here https://github.com/labstack/echo/blob/c6f0c667f145b5e5347ba812c9de5a5a4280bac5/echo.go#L371 and you probably will see here things go south
If you do not have experience with debugger then maybe https://www.digitalocean.com/community/tutorials/debugging-go-code-with-visual-studio-code helps. assuming you are using vscode.
Part of the problem seems to be Echo returns the string raw without processing its characters...? I'm not entirely sure. But modifying the error message and inserting tab characters
\t makes those characters appear directly in the response instead of being processed, so I'm guessing something happens there and an escaped backslash \\ in the string is returned as-is
Assuming that error ends up in global error handler. then it is sent to client by that line https://github.com/labstack/echo/blob/c6f0c667f145b5e5347ba812c9de5a5a4280bac5/echo.go#L400 if that message is already been escaped some characters will be double escaped to be valid json string value.
the field that is returning as base64 is a []byte in the struct
see https://pkg.go.dev/encoding/json#Marshal
Array and slice values encode as JSON arrays, except that []byte encodes as a base64-encoded string, and a nil slice encodes as the null JSON value.
How to use a gRPC service with echo framework. I have the same question from: https://stackoverflow.com/questions/67558481/how-to-use-grpc-with-golang-echo-framework
just implement layered architecture in our application and design HTTP and GRPC handlers in your transport layer that extract their data and pass it t your business service layer.
search for "Onion Architecture" / "Hexagonal Architecture"
quick googling gives me for Go https://blog.kinark.app/post/onion-architecture/ which seems decent article
1 reply
I noticed a paniced request flow is being retried 3 times, can't understand why would that happen
Why does this error occur in Echo? "Please provide valid credentials"
hi! is it possible to use the proxy middleware to proxy a unix socket? I am getting
{"message":"remote unix:///tmp/ttyd.sock unreachable, could not forward: unsupported protocol scheme \"unix\""}
You could try
proxyConf := middleware.ProxyConfig{
// your other settings
Transport: &http.Transport{
DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
return net.Dial("unix", addr)
},
},
}
e.Use(middleware.ProxyWithConfig(proxyConf))maybe it works.
3 replies
panic: echo: proxy middleware requires balancer
goroutine 1 [running]:
github.com/labstack/echo/v4/middleware.ProxyWithConfig({0x1319698, {0x0, 0x0}, 0x0, 0x0, {0x0, 0x0}, {0x13641a0, 0xc00013d040}, 0x0})
/Users/matthias/go/pkg/mod/github.com/labstack/echo/v4@v4.6.1/middleware/proxy.go:214 +0x1aa
main.main()
/Users/matthias/apigw/server.go:62 +0x194
exit status 2
`
should I just pass an empty balancer?
with an empty balancer:
echo: http: panic serving [::1]:61352: runtime error: invalid memory address or nil pointer dereference
goroutine 6 [running]:
net/http.(*conn).serve.func1()
/usr/local/Cellar/go/1.17.2/libexec/src/net/http/server.go:1801 +0xb9
panic({0x12b0840, 0x154adf0})
/usr/local/Cellar/go/1.17.2/libexec/src/runtime/panic.go:1047 +0x266
net/http/httputil.NewSingleHostReverseProxy(0x0)
/usr/local/Cellar/go/1.17.2/libexec/src/net/http/httputil/reverseproxy.go:144 +0x1d
github.com/labstack/echo/v4/middleware.proxyHTTP(0xc0000668a0, {0x13736f0, 0xc00018c460}, {0x1319778, {0x136a6a0, 0xc0000134e0}, 0x0, 0x0, {0x0, 0x0}, ...})
/Users/matthias/go/pkg/mod/github.com/labstack/echo/v4@v4.6.1/middleware/proxy.go:279 +0x45
github.com/labstack/echo/v4/middleware.ProxyWithConfig.func1.1({0x13736f0, 0xc00018c460})
/Users/matthias/go/pkg/mod/github.com/labstack/echo/v4@v4.6.1/middleware/proxy.go:260 +0x5d0
github.com/labstack/echo/v4.(*Echo).add.func1({0x13736f0, 0xc00018c460})
/Users/matthias/go/pkg/mod/github.com/labstack/echo/v4@v4.6.1/echo.go:552 +0x51
github.com/labstack/echo/v4.(*Echo).ServeHTTP(0xc000014fc0, {0x136a8e0, 0xc00017e2a0}, 0xc00019e000)
/Users/matthias/go/pkg/mod/github.com/labstack/echo/v4@v4.6.1/echo.go:662 +0x3bc
net/http.serverHandler.ServeHTTP({0xc0001917d0}, {0x136a8e0, 0xc00017e2a0}, 0xc00019e000)
/usr/local/Cellar/go/1.17.2/libexec/src/net/http/server.go:2878 +0x43b
net/http.(*conn).serve(0xc00018c3c0, {0x136bb00, 0xc0001916e0})
/usr/local/Cellar/go/1.17.2/libexec/src/net/http/server.go:1929 +0xb08
created by net/http.(*Server).Serve
/usr/local/Cellar/go/1.17.2/libexec/src/net/http/server.go:3033 +0x4e8
Yeah I am very new to go. Literally just started today
Thanks for the pointers
when proxying multiple things like:
serverA -> /serverB -> /api
can I make serverA not overwrite serverB on /api? Because I can't figure it out haha
skipper seems to work for this purpose
