TraceZ zpage is broken for spans names with characters that require url encoding

[jkwatson]

Describe the bug
The tracez zpage does not work correctly with span names that contain characters that require url encoding.

Steps to reproduce
Create a sample with spans called "/users/{id}/address" and "my span name with spaces in it". Run the app, go to the tracez page, click on the links to samples of those spans.

What did you expect to see?
The page to render the span names, and show the sampled spans in the details section at the bottom

What did you see instead?
The span name is mangled, with url-coded characters in it. No sampled spans are displayed.

What version and what artifacts are you using?
Artifacts: opentelemetry-sdk-extension-zpages
Version: 0.7.0-SNAPSHOT
How did you reference these artifacts? (excerpt from your build.gradle, pom.xml, etc)
I built the project locally and referenced them from my build.gradle.

Environment
Compiler:

openjdk version "11.0.7" 2020-04-14
OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.7+10)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.7+10, mixed mode)

OS: MacOSX v.10.14.6 (Mojave)
Runtime (if different from JDK above): same as above
OS (if different from OS compiled on): same as above

Additional context
None

[williamhu99]

I removed the URLEncoder from TracezZPageHandler and built a sample app locally, and everything seems to be running fine. I'm a little concerned because I initially added the URLEncoder due to this comment. Based on this, it seems that the spaces aren't actually being changed to +'s. I'll create a pull request, so you can verify if this is true on your end.

[jkwatson]

I'm pretty sure this is fixed now. closing.