Different Vendors Download Different Byte Counts for Same File

Problem description

An identical file was accelerated by two CDNs, and it was found that the Total Download Bytes was different. Alibaba’s total download size was about 0.76KB, and Tencent’s task was about 0.4KB. Analyze the reasons.

Problem analysis

First check the file size, check it through packet capture, it is 0.4K

2. View Tingyun scattered point data
(1) Check whether the data Request header is transmitted in compressed form
Both tasks are transmitted in uncompressed form.

(2) It is found that the response headers of the two tasks are different

Problem summary

The Total Download Bytes includes: response header and response content

Judging from the report data, the Total Download Bytes for the two tasks is different due to different response headers, as shown in the figure

Currently there is no single indicator that can represent the response content.

The two tasks use full-page tasks. For this interface, it is recommended to use single-file download tasks.

When using a single file download task, if the file is fixed and consistent, setting MD5 is recommended. If it is an interface, the correct text of settings is recommended.

Different Vendors Download Different Byte Counts for Same File

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