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small refactoring of fetch

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Brandon Liu
2021-02-25 16:10:29 +08:00
parent 8b0b193855
commit 8eb3a15549
1 changed files with 6 additions and 3 deletions
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9
js/pmtiles.js
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@@ -40,12 +40,13 @@
}
class PMTiles {
constructor(url,ready) {
constructor(url,headers={},ready) {
headers.Range = 'bytes=0-511999'
this.url = url
this.rootdir = fetch(this.url,{method:'HEAD',headers:{'Range':'bytes=0-511999'}}).then(resp => {
this.rootdir = fetch(this.url,{method:'HEAD',headers:headers}).then(resp => {
if (resp.status == 206) { // this does not work on Azure, it returns 200 instead of 206
console.log("Check succeeded: server supports byte ranges")
return fetch(this.url,{headers:{'Range':'bytes=0-511999'}}).then(resp => {
return fetch(this.url,{headers:headers}).then(resp => {
return resp.arrayBuffer()
}).then(buf => {
const header = parseHeader(new DataView(buf,0,10))
@@ -55,6 +56,8 @@
}
return bytesToMap(new DataView(buf,10+header.json_size,17*header.root_entries))
})
} else {
throw new Error("Invalid response: " + resp.status)
}
})
this.step = 0