EC
io.EOF
GoINFOCommonIO

EOF

Quick Answer

Compare err == io.EOF directly to detect end-of-stream and stop reading.

What this means

Signals the end of a readable stream; not an error in the traditional sense but a sentinel value used to stop reading loops.

Why it happens
  1. 1Reader has no more data to return
  2. 2HTTP response body fully consumed

Fix

Break on EOF in read loop

Break on EOF in read loop
for {
    _, err := r.Read(buf)
    if err == io.EOF { break }
    if err != nil { log.Fatal(err) }
}

Why this works

Treating io.EOF as a normal loop terminator prevents false error reporting.

Code examples
Read loopgo
buf := make([]byte, 512)
for {
    n, err := r.Read(buf)
    if err == io.EOF { break }
    _ = n
}
bufio.Scanner avoids EOFgo
s := bufio.NewScanner(r)
for s.Scan() { fmt.Println(s.Text()) }
io.ReadAllgo
data, err := io.ReadAll(r)
// EOF handled internally
Sources
Official documentation ↗

Go standard library

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