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| /** | |
| * XmlHttpRequest's getAllResponseHeaders() method returns a string of response | |
| * headers according to the format described here: | |
| * http://www.w3.org/TR/XMLHttpRequest/#the-getallresponseheaders-method | |
| * This method parses that string into a user-friendly key/value pair object. | |
| */ | |
| function parseResponseHeaders(headerStr) { | |
| var headers = {}; | |
| if (!headerStr) { | |
| return headers; | |
| } | |
| var headerPairs = headerStr.split('\u000d\u000a'); | |
| for (var i = 0; i < headerPairs.length; i++) { | |
| var headerPair = headerPairs[i]; | |
| // Can't use split() here because it does the wrong thing | |
| // if the header value has the string ": " in it. | |
| var index = headerPair.indexOf('\u003a\u0020'); | |
| if (index > 0) { | |
| var key = headerPair.substring(0, index); | |
| var val = headerPair.substring(index + 2); | |
| headers[key] = val; | |
| } | |
| } | |
| return headers; | |
| } |
a) Not a particular reason for favoring the actual characters over Unicode. It was just how the spec was written so I thought I'd mimic that.
b) The value of the header could have a ": " in it, in which case using split() would return an incorrect value. You could join the value back together, but that is extra work. Also, .split('\u003a\u0020', 2) doesn't do what I would expect; it only returns the first two elements of the split(), not the entire value. For example, "a.b.c.d".split(".", 2) only returns ["a", "b"], not ["a", "b.c.d"]
XMLHttpRequest.prototype.responseHeaderObject = function () { var headerStr = this.getAllResponseHeaders(); var headers = {}; if (!headerStr) { return headers; } .... 
Thanks you very much. Did the trick.
In coffeescript
window.parseResponseHeaders = (headerStr) -> headers = {} if !headerStr return headers headerPairs = headerStr.split('\u000d\u000a') for i in [0...headerPairs.length] by 1 headerPair = headerPairs[i] # Can't use split() here because it does the wrong thing # if the header value has the string ": " in it. index = headerPair.indexOf('\u003a\u0020') if index > 0 key = headerPair.substring(0, index) val = headerPair.substring(index + 2) headers[key] = val return headers 
What if header keys appear multiple times? The Link header is a good candidate.
Hi Monsur. It appears gist:706839 is now being used by Aurelia http-client - aurelia/http-client@01afa7a#diff-1ea1ae08eaece225ce69433b5147bdb1;
Aurelia http-client is offered under the MIT License.
Do you have a specific license in mind that you wish to apply to gist:706839?
Thanks!
Hello Monsur. Following up on devaniyer's comment above, it would be greatly appreciated if you could apply a license to this gist so that others can determine how/if the code can be used.
No license is always proper to use right? I don't really think Monsur would mind if you would use this :p
Here's my solution:
function getHeadersAsObject(xhr) { let headers = {} xhr.getAllResponseHeaders() .split('\u000d\u000a') .forEach((line) => { if (line.length > 0) { let delimiter = '\u003a\u0020', header = line.split(delimiter) headers[header.shift().toLowerCase()] = header.join(delimiter) } }) return headers } This work is dedicated to the public domain.
function parseResponseHeaders(headerStr) { return Object.fromEntries( (headerStr || '').split('\u000d\u000a') // '\n' .map(line => line.split('\u003a\u0020')) // ": " .filter(pair => pair[0] !== undefined && pair[1] !== undefined) ); }
So... out of curiosity - why use
a) escaped unicode instead of ': ' (i can see why you might use it for newlines)
b) why not use headerPair.split(...)? Something like:
var tokens = headerPair.split('\u003a\u0020'); if (tokens.length === 2) { headers[tokens[0]] = tokens[1]; }might be less verbose neh? Though your method IS much more readable.