Issue #15873 has been updated by nobu (Nobuyoshi Nakada).

Status changed from Open to Closed

Probably you are using `frozen-string-literal` pragma.
Since 2.6, OpenURI clears the buffer from `Net::HTTPResponse#read_body` to reduce memory usage.
See [Feature #14320].


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Bug #15873: FrozenError when using OpenURI.open
https://bugs.ruby-lang.org/issues/15873#change-78198

* Author: AlexGascon (Alex Gascon)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-linux]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
I just updated from Ruby 2.5.1 to 2.6.3 and I encountered a strange problem on a part that was working fine previously. It's on a Rails application, and on one of the tests I'm stubbing (using [webmock](https://github.com/bblimke/webmock)) an HTTP request that we perform to an external URL. However, when trying to access the information by using OpenURI I get a `FrozenError`. 

The following block represents a minimal reproducible example of the problem that I'm experiencing

``` ruby
stub_request(:get, "https://files.lol/certificate_doc.pdf").to_return(status: 200, body: "Random information", headers: {})

file_content = open("https://files.lol/certificate_doc.pdf")

FrozenError: can't modify frozen String
from /home/alex/.rbenv/versions/2.6.3/lib/ruby/2.6.0/open-uri.rb:357:in `clear'
```




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