@@ -229,7 +229,7 @@ class RetryHandler {
         return false
       }
 
-      const { start, size, end = size } = contentRange
+      const { start, size, end = size - 1 } = contentRange
 
       assert(this.start === start, 'content-range mismatch')
       assert(this.end == null || this.end === end, 'content-range mismatch')
@@ -252,7 +252,7 @@ class RetryHandler {
           )
         }
 
-        const { start, size, end = size } = range
+        const { start, size, end = size - 1 } = range
         assert(
           start != null && Number.isFinite(start),
           'content-range mismatch'
@@ -266,7 +266,7 @@ class RetryHandler {
       // We make our best to checkpoint the body for further range headers
       if (this.end == null) {
         const contentLength = headers['content-length']
-        this.end = contentLength != null ? Number(contentLength) : null
+        this.end = contentLength != null ? Number(contentLength) - 1 : null
       }
 
       assert(Number.isFinite(this.start))
 
@@ -253,14 +253,15 @@ test('Should handle 206 partial content', async t => {
   const server = createServer((req, res) => {
     if (x === 0) {
       t.ok(true, 'pass')
+      res.setHeader('content-length', '6')
       res.setHeader('etag', 'asd')
       res.write('abc')
       setTimeout(() => {
         res.destroy()
       }, 1e2)
     } else if (x === 1) {
-      t.deepStrictEqual(req.headers.range, 'bytes=3-')
-      res.setHeader('content-range', 'bytes 3-6/6')
+      t.deepStrictEqual(req.headers.range, 'bytes=3-5')
+      res.setHeader('content-range', 'bytes 3-5/6')
       res.setHeader('etag', 'asd')
       res.statusCode = 206
       res.end('def')
Original file line number	Diff line number	Diff line change
`@@ -229,7 +229,7 @@ class RetryHandler {`
`229`	`229`	`return false`
`230`	`230`	`}`
`231`	`231`
`232`		`- const { start, size, end = size } = contentRange`
	`232`	`+ const { start, size, end = size - 1 } = contentRange`
`233`	`233`
`234`	`234`	`assert(this.start === start, 'content-range mismatch')`
`235`	`235`	`assert(this.end == null \|\| this.end === end, 'content-range mismatch')`
`@@ -252,7 +252,7 @@ class RetryHandler {`
`252`	`252`	`)`
`253`	`253`	`}`
`254`	`254`
`255`		`- const { start, size, end = size } = range`
	`255`	`+ const { start, size, end = size - 1 } = range`
`256`	`256`	`assert(`
`257`	`257`	`start != null && Number.isFinite(start),`
`258`	`258`	`'content-range mismatch'`
`@@ -266,7 +266,7 @@ class RetryHandler {`
`266`	`266`	`// We make our best to checkpoint the body for further range headers`
`267`	`267`	`if (this.end == null) {`
`268`	`268`	`const contentLength = headers['content-length']`
`269`		`- this.end = contentLength != null ? Number(contentLength) : null`
	`269`	`+ this.end = contentLength != null ? Number(contentLength) - 1 : null`
`270`	`270`	`}`
`271`	`271`
`272`	`272`	`assert(Number.isFinite(this.start))`