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rpc: allow dumb empty requests for AWS health checks

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Péter Szilágyi 2017-11-16 13:51:06 +02:00
parent 5aa3eac22d
commit 4013e23312
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GPG Key ID: E9AE538CEDF8293D
1 changed files with 10 additions and 7 deletions
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17
rpc/http.go
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@ -146,13 +146,17 @@ func NewHTTPServer(cors []string, srv *Server) *http.Server {
// ServeHTTP serves JSON-RPC requests over HTTP.
func (srv *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// Permit dumb empty requests for remote health-checks (AWS)
if r.Method == "GET" && r.ContentLength == 0 && r.URL.RawQuery == "" {
return
}
// For meaningful requests, validate it's size and content type
if r.ContentLength > maxHTTPRequestContentLength {
http.Error(w,
fmt.Sprintf("content length too large (%d>%d)", r.ContentLength, maxHTTPRequestContentLength),
http.StatusRequestEntityTooLarge)
return
}
ct := r.Header.Get("content-type")
mt, _, err := mime.ParseMediaType(ct)
if err != nil || mt != "application/json" {
@ -161,14 +165,13 @@ func (srv *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
http.StatusUnsupportedMediaType)
return
}
w.Header().Set("content-type", "application/json")
// create a codec that reads direct from the request body until
// EOF and writes the response to w and order the server to process
// a single request.
// All checks passed, create a codec that reads direct from the request body
// untilEOF and writes the response to w and order the server to process a
// single request.
codec := NewJSONCodec(&httpReadWriteNopCloser{r.Body, w})
defer codec.Close()
w.Header().Set("content-type", "application/json")
srv.ServeSingleRequest(codec, OptionMethodInvocation)
}