HTTP Protocol Performance Optimization: Practical Methods and Practical Tips to Share

in the running link of Web applications, HTTP protocol is the core carrier of data transmission, and its performance directly affects the page loading speed, user retention rate and even business conversion effect. Many developers often encounter problems such as page loading cards and request response delays in practical work, but they do not know how to start optimization. This article will start from the characteristics of HTTP protocol and combine actual business scenarios to disassemble multiple performance optimization methods that can be implemented to help practitioners quickly improve the transmission efficiency of Web applications.

What can HTTP protocol version upgrade bring?

different versions of HTTP protocol have significant differences in transmission mechanism, version upgrade is the basis and efficient means of performance optimization.

1 Optimization from HTTP/1.x to HTTP/2

HTTP/1.x has the problem of queue head blocking, and only one request can be processed at the same time under the same connection, resulting in a delay in loading multiple resources. HTTP/2 adopts multiplexing technology, which can transmit multiple requests and responses simultaneously on the same TCP connection, greatly improving the concurrency efficiency; at the same time, it introduces binary framing, header compression and other characteristics to further reduce the data transmission volume. Compared with HTTP/1.x, it can reduce the page loading time by about 30%.

2, frontier optimization direction of HTTP/3

HTTP/3 is based on the QUIC protocol implementation, which solves the problem of queue blocking of the TCP protocol itself. Even if a single data packet is lost, it will not affect the transmission of other data streams. In the weak connection environment, the advantages of HTTP/3 are more obvious, which can reduce the page loading failure rate by about 20%. It is suitable for e-commerce and live broadcast Web applications with high transmission stability requirements.

Streamlined policy for HTTP protocol request resources

HTTP protocol depends not only on the protocol itself, but also closely related to the volume and quantity of resources transmitted.

1, resource consolidation and compression

for CSS, JS and other text resources, can be combined into a single file through tools to reduce the number of HTTP protocol requests; at the same time, Gzip or Brotli compression can usually compress the resource volume to 30% -50% of the original size. Image resources can be used WebP, AVIF and other modern formats, under the premise of ensuring image quality, the volume is 20% -30% smaller than JPEG and PNG, further reducing the transmission load of HTTP protocol.

2, on-demand loading and lazy loading

for resources that are not necessary for the first screen, such as pictures displayed after scrolling and untriggered function modules JS, on-demand loading or lazy loading strategies can be adopted to avoid initiating a large number of HTTP protocol requests during initial loading and reduce the loading time of the first screen. For example, the e-commerce product list page can only load the first screen picture, and then request subsequent picture resources through the HTTP protocol when the user scrolls.

3. The landing method of HTTP protocol caching strategy

reasonable use of the cache mechanism of the HTTP protocol, it can avoid repeated requests for the same resources and read data directly from the local, which is a low-cost solution to improve performance.

1, strong cache rule configuration

by setting the Cache-Control and Expires fields in the HTTP protocol response header, you can specify the strong cache time of the resource. For example, setting Cache-Control: max-age = 86400 means that the resource is read directly from the local cache within 24 hours without initiating an HTTP protocol request to the server. Note that adding a hash suffix to static resources, when the resource is updated, the hash value change will automatically trigger a new HTTP protocol request.

2, flexible use of negotiation cache

when the strong cache fails, it can verify whether the resource is updated through the negotiation cache of the HTTP protocol. The server compares the resource status through the Last-Modified/If-Modified-Since or ETag/If-One-Match fields, and returns the 304 status code if it is not updated. There is no need to transmit the resource body, which reduces the data transmission volume of the HTTP protocol. For dynamic resources that are updated frequently, the negotiation cache can reduce the transmission cost while ensuring the freshness of the data.

4. Optimization skills of HTTP protocol request link

in addition to the protocol itself and the resource level, the request link length and node quality of the HTTP protocol will also affect the transmission performance, and optimizing the link can further shorten the response time.

1, reasonable deployment of CDN nodes

deploy static resources to CDN nodes, when a user initiates an HTTP protocol request, it will automatically schedule to the nearest node to obtain resources, avoiding the delay caused by long-term link transmission across regions. For example, after deploying a CDN, the response time of HTTP protocol requests for static resources can be reduced from hundreds of milliseconds to tens of milliseconds, greatly improving page loading speed.

2, request domain name split and reuse

HTTP/1.x has a limit on the number of concurrent requests for the same domain name, which can be improved by splitting multiple subdomains, but it should be noted that the number of domain names should not be too large to avoid the increase in DNS resolution time. HTTP/2 recommends multiplexing the same domain name to reduce the overhead of TCP connection establishment, give full play to the advantages of multiplexing, and optimize the transmission efficiency of HTTP protocol.

sum up, HTTP protocol performance optimization is a multi-dimensional system engineering, from version upgrade to resource streamlining, from cache strategy to link optimization, each link can improve the transmission efficiency of Web applications. Developers need to combine their own business scenarios, choose the appropriate optimization scheme, through continuous testing and adjustment, so that the transmission capacity of HTTP protocol can be fully exerted, and finally achieve the goal of faster page loading and better user experience.