我目前正在树莓派上使用dialogflow api。
使用 grpc 调用 StreamingDetectIntent 方法时一切正常。
我必须在我的产品上使用多个 api，因此，我尝试在它们前面放置一个反向代理。这样我就只能调用一个地址
我正在使用 nginx 将我的 GRPC 请求反向代理到 google api。
调用简单方法时没有问题，但是当调用像 StreamingDetectIntent 这样的流方法时，我在请求期间收到错误。
Dialogflow 获取来自客户端的音频流量没有问题，但获取请求的最后部分（下游流量）时遇到问题。
这是我的客户给我的错误：
grpc._channel._Rendezvous: <_Rendezvous of RPC that terminated with:
status = StatusCode.INTERNAL
details = "Received RST_STREAM with error code 2"
debug_error_string = "{"created":"@1567173815.816362297","description":"Error received from peer ipv4:163.172.143.250:443","file":"src/core/lib/surface/call.cc","file_line":1041,"grpc_message":"Received RST_STREAM with error code 2","grpc_status":13}"
>
我可以在 Nginx 日志中看到错误：
upstream sent frame for closed stream 1 while reading upstream, client: ..., server: exemple.com, request: "POST /google.cloud.dialogflow.v2beta1.Sessions/StreamingDetectIntent HTTP/2.0", upstream: "grpcs://...:443", host: "example.com:443"
我尝试将 grpc_buffer_size 参数增加到大值，但没有成功。
这是我当前的 Nginx 配置：
user nginx;
worker_processes 1;
error_log /var/log/nginx/error.log debug;
pid /var/run/nginx.pid;
events {
worker_connections 1024;
}
http {
include /etc/nginx/mime.types;
default_type application/octet-stream;
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /var/log/nginx/access.log main;
sendfile on;
keepalive_timeout 65;
client_max_body_size 4000M;
grpc_read_timeout 1d;
grpc_send_timeout 1d;
# this seems to fix it; but see comment in README.md
grpc_buffer_size 100M;
include /etc/nginx/conf.d/*.conf;
server {
# SSL configuration
listen 443 ssl http2;
access_log /var/log/nginx/access_grpc.log main;
location / {
grpc_pass grpcs://dialogflow.googleapis.com:443;
}
ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem;
ssl_certificate_key/etc/letsencrypt/live/exemple.com/privkey.pem;
}
server {
if ($host = example.com) {
return 301 https://$host$request_uri;
}
listen 80 ;
listen [::]:80 ;
return 404; # managed by Certbot
}
}
