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Serve: send back 431 error instead of panicking when request header too big #27

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Serve: send back 431 error instead of panicking when request header too big #27

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18 changes: 17 additions & 1 deletion fsthttp/handle.go
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Original file line number Diff line number Diff line change
Expand Up @@ -4,8 +4,11 @@ package fsthttp

import (
"context"
"errors"
"fmt"
"sync"

"github.com/fastly/compute-sdk-go/internal/abi/fastly"
)

var (
Expand All @@ -23,11 +26,19 @@ func Serve(h Handler) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()

headerTooLong := false

serveOnce.Do(func() {
var err error
clientRequest, err = newClientRequest()
if err != nil {
panic(fmt.Errorf("create client Request: %w", err))
status, ok := fastly.IsFastlyError(errors.Unwrap(err))
if ok && status == fastly.FastlyStatusBufLen {
headerTooLong = true
}
if !headerTooLong {
panic(fmt.Errorf("create client Request: %w", err))
}
}
clientResponseWriter, err = newResponseWriter()
if err != nil {
Expand All @@ -36,6 +47,11 @@ func Serve(h Handler) {
})

defer clientResponseWriter.Close()
if headerTooLong {
clientResponseWriter.WriteHeader(StatusRequestHeaderFieldsTooLarge)
clientResponseWriter.Write([]byte("Request Header Fields Too Large\n"))
return
}
h.ServeHTTP(ctx, clientResponseWriter, clientRequest)
}

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