![]() ![]() Getting a 200 OK rather than a 206 Partial Content is perfectly valid per the spec, which states: Simply returns the whole file as if no range was requested. Changing the range header to include multiple ranges shows this isn’t supported, and it Next 1024 bytes (which equals 32 lines), the request/response is shown below. Using Postman to make a Range request starting on line 1001 (i.e., starting 32000 bytes in) for the Text, each 32 bytes long, with the text on each line just stating the current line number. wwwroot/large.txt containing a million lines of Run () įor these tests I dropped a file at. ![]() CreateBuilder ( args ) var app = builder. This is valid per the spec, but ASP.NET Core only supports requesting a single range. For example, itĭoes not support requesting multiple ranges in one request, such as Range: bytes=0-50, 100-150. Out of the box ASP.NET Core supports range requests with some minor limitation. Not familiar with Range requests, the page at HTTP Range requests are defined in the RFC at. (Else just skip to the end for the code!) HTTP Range Requestsįirst, what are HTTP Range Requests and what support does ASP.NET Core have for them? Hopefully youĬan find some valuable or interesting information here too. To wrestle with this topic, so there’s a good chance I’ll need it as a future reference. This is a long write-up, as it’s the second time I’ve had Fall back to unoptimized behavior, not just fail a perfectly valid request!Īnyways, getting to a satisfactory resolution required quite a bit of research, and digging into someĪSP.NET internals and nuances of the HTTP specs. Origin server doesn’t support byte-range requests, this optimization isn’t effective. This optimization relies on the ability of the origin server to support byte-range requests if the On that page for other Azure CDN caches, such as the Akamai one, you find statements such as: The last word seemed to identify the issue. The origin server doesn’t support byte-range requests, requests to download data greater than 8mb size will fail. …This optimization relies on the ability of the origin server to support byte-range requests if Receives a full or byte-range file request, the CDN edge server requests the file from the origin in Requested, the CDN retrieves smaller pieces of the file from the origin. After some digging around in the docs, we found the below commentsĪzure CDN Standard from Microsoft uses a technique called object chunking. Of through the CDN, the downloads also worked fine. ![]() When we pointed directly at the ASP.NET origin server instead On further inspection, it was noticed that it was failing on assets over 8MB, which up to recentlyĪll our assets had been less than. Months with the assets we had, but suddenly starting failing with some larger downloads. ![]() Intermediary in order to check authentication and do some other logic. Services that serves largely static content through an ASP.NET Core service. Recently I spent way too much time with a colleague digging into an issue that occurred on one of our ![]()
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