Springboot - technical topic - 404 problems in websocket + nginx

InfoQ 2020-11-06 01:15:35
springboot technical topic problems websocket

{"type":"doc","content":[{"type":"heading","attrs":{"align":null,"level":1},"content":[{"type":"text","text":" Problem description :"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" Use websocket Send a message to the merchant management system . There's no problem testing locally , But deploy to centos The server has been reporting errors since 404. Summed up a lot of online solutions are not good , All the online discussions are about tomcat Outdated Version , because websocket need tomcat7.0 The above supports ."}]},{"type":"heading","attrs":{"align":null,"level":1},"content":[{"type":"text","text":" Solutions :"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" Exclude tomcat problem ,jdk The version is also 1.8+,websocket Deploy to the server or 404, Others on the Internet say it's tomcat Of jar Packages and projects jar Conflict , But I springboot The project uses embedded tomcat, So I used Maven Helper( It works very well idea plug-in unit ) After checking the dependencies, it is found that there is no conflict . Stuck here for a long time , I took a special look at websocket Request format :"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"Websocket Handshake format :"}]},{"type":"codeblock","attrs":{"lang":null},"content":[{"type":"text","text":"GET /chat HTTP/1.1\nHost: server.example.com\nUpgrade: websocket\nConnection: Upgrade\nSec-WebSocket-Key: x3JJHMbDL1EzLkh9GBhXDw==\nSec-WebSocket-Protocol: chat, superchat\nSec-WebSocket-Version: 13\nOrigin: http://example.com12345678"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" This request is similar to http agreement , There are many strange contents in it :"}]},{"type":"codeblock","attrs":{"lang":null},"content":[{"type":"text","text":"Upgrade: websocket\nConnection: Upgrade12"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" At that time, I was confused , What kind of thing is this ? Then I Baidu next , So this is Websocket At the heart of , He will tell Apache、Nginx Wait for the server, I launched websocket request , No http! The following three parameters Sec-WebSocket-Key、Sec-WebSocket-Protocol、Sec-WebSocket-Version The effect is to verify that the request is indeed websocket, Also specify the protocol version ."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" Then it dawned on me ! My project uses nginx Did a forwarding , So it's because I don't have the configuration nginx Respond to websocket What about the request ? The answer is yes !"}]},{"type":"heading","attrs":{"align":null,"level":3},"content":[{"type":"text","text":" To configure nginx Reverse proxy response webSocket request "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" The following configuration needs to be added to the request configuration of the agent :"}]},{"type":"codeblock","attrs":{"lang":null},"content":[{"type":"text","text":"proxy_set_header Upgrade $http_upgrade;\nproxy_set_header Connection \"upgrade\";12"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"nginx The configuration is as follows :"}]},{"type":"codeblock","attrs":{"lang":null},"content":[{"type":"text","text":"server {\n listen 80;\n server_name localhost;\n #charset koi8-r;\n\n location / {\n root /usr/java/myproject/sell;\n index index.html index.htm;\n }\n\n location /sell/ {\n proxy_pass;\n }\n\nlocation /sell/webSocket {\n proxy_pass; \n proxy_set_header Upgrade $http_upgrade;\n proxy_set_header Connection \"upgrade\";\n}12345678910111213141516171819"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" This configuration is to put all the /sell The request under goes to 8081 Port processing , hold /sell/webSocket The request is forwarded to the specified request interface , Find out 404 The error disappears ,webSocket Services can also access . But there is a new problem ,webSocket Not keeping connected after connecting , It will be disconnected in about a minute , The reason is that the time from the first request to the second request exceeds the default maximum time , It's overtime . Here's a solution :"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" Three core parameters that need to be configured :"}]},{"type":"codeblock","attrs":{"lang":null},"content":[{"type":"text","text":"proxy_connect_timeout 4s; \nproxy_read_timeout 7200s; \nproxy_send_timeout 12s; 123"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"proxy_read_timeout Is the maximum time the server waits for a connection , in other words , When you webSocket Use nginx When forwarding , In terms of the above configuration , If 72000 No communication in seconds , It's still going to disconnect , You can set it according to your needs ."}]},{"type":"blockquote","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" for instance , I set up here 7200s(2 Hours ), So if I 2 There's communication within hours , perhaps 2 If there's a heartbeat within an hour , It can keep the connection uninterrupted ."}]}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" The reason why I set this up here , It takes into account the specific business situation ,2 Hours are more appropriate . The final configuration is as follows :"}]},{"type":"codeblock","attrs":{"lang":null},"content":[{"type":"text","text":"server {\n listen 80;\n server_name localhost;\n #charset koi8-r;\n\n location / {\n root /usr/java/myproject/sell;\n index index.html index.htm;\n }\n\n location /sell/ {\n proxy_pass;\n }\n\nlocation /sell/webSocket {\n proxy_pass; \n proxy_connect_timeout 4s; \n proxy_read_timeout 7200s; \n proxy_send_timeout 12s; \n proxy_set_header Upgrade $http_upgrade;\n proxy_set_header Connection \"upgrade\";\n"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}}]}

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