prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  Support httpcore>=0.16.0
  Hi,
  
  I have a project that uses `fastapi` and `uvicorn` which demands `h11>=0.8`. Latest version of `fastapi` changed their test suite from `requests` to `httpx`. So I had to add `httpx` to my tests requirements.
  
  Now the problem is, that `httpx` requires `httpcore`, which since version `0.16.0` allows for `h11==0.14.0`, but the current version of `httpcore` required by `httpx` doesn't, so I end up having to downgrade the `h11==0.14.0` which I have to `0.12.0`.
  
  Can the constraint for `httpcore` be updated to `>=0.16.0` here?
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `setup.py`
  Content:
  ```
  1 import sys
  2 
  3 from setuptools import setup
  4 
  5 sys.stderr.write(
  6     """
  7 ===============================
  8 Unsupported installation method
  9 ===============================
  10 httpx no longer supports installation with `python setup.py install`.
  11 Please use `python -m pip install .` instead.
  12 """
  13 )
  14 sys.exit(1)
  15 
  16 
  17 # The below code will never execute, however GitHub is particularly
  18 # picky about where it finds Python packaging metadata.
  19 # See: https://github.com/github/feedback/discussions/6456
  20 #
  21 # To be removed once GitHub catches up.
  22 
  23 setup(
  24     name="httpx",
  25     install_requires=[
  26         "certifi",
  27         "sniffio",
  28         "rfc3986[idna2008]>=1.3,<2",
  29         "httpcore>=0.15.0,<0.16.0",
  30     ],
  31 )
  32
  ```
  
  Path: `httpx/__version__.py`
  Content:
  ```
  1 __title__ = "httpx"
  2 __description__ = "A next generation HTTP client, for Python 3."
  3 __version__ = "0.23.0"
  4
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/httpx/__version__.py b/httpx/__version__.py
  --- a/httpx/__version__.py
  +++ b/httpx/__version__.py
  @@ -1,3 +1,3 @@
   __title__ = "httpx"
   __description__ = "A next generation HTTP client, for Python 3."
  -__version__ = "0.23.0"
  +__version__ = "0.23.1"
  diff --git a/setup.py b/setup.py
  --- a/setup.py
  +++ b/setup.py
  @@ -26,6 +26,6 @@
           "certifi",
           "sniffio",
           "rfc3986[idna2008]>=1.3,<2",
  -        "httpcore>=0.15.0,<0.16.0",
  +        "httpcore>=0.15.0,<0.17.0",
       ],
   )
  
verification_info: {"golden_diff": "diff --git a/httpx/__version__.py b/httpx/__version__.py\n--- a/httpx/__version__.py\n+++ b/httpx/__version__.py\n@@ -1,3 +1,3 @@\n __title__ = \"httpx\"\n __description__ = \"A next generation HTTP client, for Python 3.\"\n-__version__ = \"0.23.0\"\n+__version__ = \"0.23.1\"\ndiff --git a/setup.py b/setup.py\n--- a/setup.py\n+++ b/setup.py\n@@ -26,6 +26,6 @@\n         \"certifi\",\n         \"sniffio\",\n         \"rfc3986[idna2008]>=1.3,<2\",\n-        \"httpcore>=0.15.0,<0.16.0\",\n+        \"httpcore>=0.15.0,<0.17.0\",\n     ],\n )\n", "issue": "Support httpcore>=0.16.0\nHi,\r\n\r\nI have a project that uses `fastapi` and `uvicorn` which demands `h11>=0.8`. Latest version of `fastapi` changed their test suite from `requests` to `httpx`. So I had to add `httpx` to my tests requirements.\r\n\r\nNow the problem is, that `httpx` requires `httpcore`, which since version `0.16.0` allows for `h11==0.14.0`, but the current version of `httpcore` required by `httpx` doesn't, so I end up having to downgrade the `h11==0.14.0` which I have to `0.12.0`.\r\n\r\nCan the constraint for `httpcore` be updated to `>=0.16.0` here?\n", "before_files": [{"content": "import sys\n\nfrom setuptools import setup\n\nsys.stderr.write(\n    \"\"\"\n===============================\nUnsupported installation method\n===============================\nhttpx no longer supports installation with `python setup.py install`.\nPlease use `python -m pip install .` instead.\n\"\"\"\n)\nsys.exit(1)\n\n\n# The below code will never execute, however GitHub is particularly\n# picky about where it finds Python packaging metadata.\n# See: https://github.com/github/feedback/discussions/6456\n#\n# To be removed once GitHub catches up.\n\nsetup(\n    name=\"httpx\",\n    install_requires=[\n        \"certifi\",\n        \"sniffio\",\n        \"rfc3986[idna2008]>=1.3,<2\",\n        \"httpcore>=0.15.0,<0.16.0\",\n    ],\n)\n", "path": "setup.py"}, {"content": "__title__ = \"httpx\"\n__description__ = \"A next generation HTTP client, for Python 3.\"\n__version__ = \"0.23.0\"\n", "path": "httpx/__version__.py"}], "after_files": [{"content": "import sys\n\nfrom setuptools import setup\n\nsys.stderr.write(\n    \"\"\"\n===============================\nUnsupported installation method\n===============================\nhttpx no longer supports installation with `python setup.py install`.\nPlease use `python -m pip install .` instead.\n\"\"\"\n)\nsys.exit(1)\n\n\n# The below code will never execute, however GitHub is particularly\n# picky about where it finds Python packaging metadata.\n# See: https://github.com/github/feedback/discussions/6456\n#\n# To be removed once GitHub catches up.\n\nsetup(\n    name=\"httpx\",\n    install_requires=[\n        \"certifi\",\n        \"sniffio\",\n        \"rfc3986[idna2008]>=1.3,<2\",\n        \"httpcore>=0.15.0,<0.17.0\",\n    ],\n)\n", "path": "setup.py"}, {"content": "__title__ = \"httpx\"\n__description__ = \"A next generation HTTP client, for Python 3.\"\n__version__ = \"0.23.1\"\n", "path": "httpx/__version__.py"}]}