How to make proxy http to tcp to send only raw "body" using envoy? - http

Question

I want to send http request to envoy and after that envoy send only body to tcp server
My steps:
Create tcp listen port nc -l 13370
deploy envoy in docker on same host (:10000 port)
Execute command curl -d "Hello" -X POST localhost:10000
I use this envoy settings
static_resources:
listeners:
- name: listener_0
address:
socket_address:
address: 0.0.0.0
port_value: 10000
filter_chains:
- filters:
- name: envoy.filters.network.http_connection_manager
typed_config:
"#type": type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
stat_prefix: ingress_http
access_log:
- name: envoy.access_loggers.stdout
typed_config:
"#type": type.googleapis.com/envoy.extensions.access_loggers.stream.v3.StdoutAccessLog
http_filters:
- name: lua_filter_cutting_head
typed_config:
"#type": type.googleapis.com/envoy.extensions.filters.http.lua.v3.Lua
default_source_code:
inline_string:
function envoy_on_request(request_handle)
request_handle:headers():remove("host")
request_handle:headers():remove("user-agent")
request_handle:headers():remove("x-envoy-expected-rq-timeout-ms")
end
- name: envoy.filters.http.router
typed_config:
"#type": type.googleapis.com/envoy.extensions.filters.http.router.v3.Router
route_config:
name: local_route
virtual_hosts:
- name: local_service
domains: ["*"]
routes:
- match:
prefix: "/"
route:
cluster: cluster_0
clusters:
- name: cluster_0
type: STATIC
dns_lookup_family: V4_ONLY
load_assignment:
cluster_name: cluster_0
endpoints:
- lb_endpoints:
- endpoint:
address:
socket_address:
address: 192.168.0.23
port_value: 13370
Client --(http)-- envoy --(tcp)-- tcp_server (receive only "Hello)
So i want to see on my tcp_server only "Hello", but i see
POST / HTTP/1.1
accept: */*
content-length: 5
content-type: application/x-www-form-urlencoded
x-forwarded-proto: http
x-request-id: 8cc7670c-faf5-4ca8-aa97-b3674d81c28a
x-envoy-expected-rq-timeout-ms: 15000
Hello

Answer 1

Working config
admin:
address:
socket_address:
protocol: TCP
address: 127.0.0.1
port_value: 9902
static_resources:
listeners:
- name: listener_0
address:
socket_address:
address: 0.0.0.0
port_value: 10000
filter_chains:
- filters:
- name: envoy.filters.network.http_connection_manager
typed_config:
"#type": type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
stat_prefix: ingress_http
route_config:
name: local_route
virtual_hosts:
- name: local_service
domains:
- "*"
routes:
- match:
prefix: "/"
headers:
- name: ":method"
string_match:
exact: "POST"
route:
cluster: service
upgrade_configs:
- upgrade_type: CONNECT
connect_config:
allow_post: true
http_filters:
- name: envoy.filters.http.router
typed_config:
"#type": type.googleapis.com/envoy.extensions.filters.http.router.v3.Router
http2_protocol_options:
allow_connect: true
clusters:
- name: service
connect_timeout: 0.25s
type: LOGICAL_DNS
dns_lookup_family: V4_ONLY
lb_policy: ROUND_ROBIN
load_assignment:
cluster_name: service
endpoints:
- lb_endpoints:
- endpoint:
address:
socket_address:
address: 192.168.0.31
port_value: 13370
```