Add proxy support

[codecov[bot]]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (efb9c63) 84.07% compared to head (62d9945) 83.86%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #73 +/- ## ============================================ - Coverage 84.07% 83.86% -0.21% Complexity 640 640 ============================================ Files 86 86 Lines 1877 1884 +7 Branches 146 148 +2 ============================================ + Hits 1578 1580 +2 - Misses 223 226 +3 - Partials 76 78 +2 ``` | [Files](https://app.codecov.io/gh/OpenConext/OpenConext-pdp/pull/73?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenConext) | Coverage Δ | | |---|---|---| | [...er/src/main/java/pdp/manage/UrlResourceManage.java](https://app.codecov.io/gh/OpenConext/OpenConext-pdp/pull/73?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OpenConext#diff-cGRwLXNlcnZlci9zcmMvbWFpbi9qYXZhL3BkcC9tYW5hZ2UvVXJsUmVzb3VyY2VNYW5hZ2UuamF2YQ==) | `59.42% <28.57%> (-3.49%)` | :arrow_down: |

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