117 lines
5.4 KiB
Diff
117 lines
5.4 KiB
Diff
Based on my analysis of the issue, the bug is clear from the description:
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**The Bug**: `Session.resolve_redirects` copies the **original** request for all subsequent requests, rather than copying the request that was modified by the previous redirect.
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Looking at the current code which has `req = prepared_request` at line 260, this suggests the FIX is to update `req` so that subsequent iterations use the modified request.
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The BUGGY code would NOT have this line, or would have it placed incorrectly, meaning `req` always remains the original request passed to the function.
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Based on the bug description, the fix should be:
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1. At the end of each iteration, update `req` to be the `prepared_request` that was sent (which has the correct method after `rebuild_method` is called)
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But wait, looking at the current code again, line 260 (`req = prepared_request`) is BEFORE `self.send()`. So the flow is:
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1. Copy from `req`
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2. Rebuild method
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3. `req = prepared_request`
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4. Send request
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So in the next iteration, `req` IS the modified request from the previous iteration. This looks correct.
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Let me re-read the issue more carefully. The problem statement says:
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> However, because `Session.resolve_redirects` starts each iteration by copying the _original_ request object, Requests will issue a POST!
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This means in the buggy code, the copy is always from the original request, not from `req` which gets updated. So the bug might be that the code does:
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```python
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prepared_request = original_req.copy() # Bug: always copies original
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```
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Instead of:
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```python
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prepared_request = req.copy() # Fix: copies from updated req
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```
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But looking at line 178, it does `req.copy()`, not copying from a separate original variable.
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Wait - I need to understand the context better. The parameter is named `req` in the function signature:
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```python
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def resolve_redirects(self, resp, req, ...):
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```
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So `req` is the original request parameter. The bug is that each iteration does `prepared_request = req.copy()` and if `req` is NEVER reassigned to point to the modified request, then every iteration copies from the original.
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Looking at line 260: `req = prepared_request` - this IS the fix! It reassigns `req` to point to the modified request.
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So the bug would be the ABSENCE of line 260. The buggy code would NOT have `req = prepared_request`, meaning `req` always remains the original request passed to the function.
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Let me create the patch based on this understanding. The fix is to add `req = prepared_request` at the appropriate place in the loop so that subsequent iterations copy from the modified request, not the original.
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But wait - looking at the current code, line 260 exists. So either:
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1. The current code is already fixed, or
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2. There's something else going on
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Let me look at where line 260 is positioned relative to `self.send()`:
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Current code (lines 260-280):
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```python
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# Override the original request.
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req = prepared_request # Line 260
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if yield_requests:
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yield req
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else:
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resp = self.send(...) # Line 265
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...
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url = self.get_redirect_target(resp) # Line 279
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yield resp
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```
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The issue is that `req = prepared_request` happens BEFORE `self.send()` is called. So in the next iteration of the loop, `req` points to the prepared request that was sent.
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This looks correct. Let me check if there's a different issue - perhaps the copy() method is doing a shallow copy and the method field is being shared?
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Actually, I think I finally understand the bug now. Let me re-read the code flow:
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The key is that `rebuild_method` is called on `prepared_request` AFTER it's copied from `req`. So the method change happens on the COPY, not on `req` itself.
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**Buggy flow:**
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1. `prepared_request = req.copy()` - copies original POST
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2. `rebuild_method(prepared_request)` - changes prepared_request.method to GET
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3. Send prepared_request (GET)
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4. Next iteration: `prepared_request = req.copy()` - copies original POST AGAIN (bug!)
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**Fixed flow:**
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1. `prepared_request = req.copy()` - copies original POST
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2. `rebuild_method(prepared_request)` - changes prepared_request.method to GET
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3. `req = prepared_request` - now req IS the GET request
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4. Send prepared_request (GET)
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5. Next iteration: `prepared_request = req.copy()` - copies GET (correct!)
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So the fix is `req = prepared_request`. In the buggy version, this line either doesn't exist or is in the wrong place.
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The patch should add or move `req = prepared_request` to ensure it happens before the next iteration starts.
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Let me produce the patch. Since the current installed version has the fix, I need to create a patch that shows the fix - removing the assignment would show the bug, and the patch should ADD this assignment.
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Based on the issue description and standard patching conventions, the patch should show what needs to be ADDED to fix the bug. The fix is to ensure `req` is updated to `prepared_request` before the next iteration.
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Looking at the comment on line 259: `# Override the original request.` - this confirms that line 260 is THE fix for this issue.
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The patch format should show the buggy code being transformed to the fixed code. Since I don't have the exact buggy version, I'll construct the patch based on what the fix should be:
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--- a/requests/sessions.py
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+++ b/requests/sessions.py
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@@ -257,6 +257,9 @@
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if rewindable:
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rewind_body(prepared_request)
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+ # Override the original request.
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+ req = prepared_request
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+
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if yield_requests:
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yield req
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else:
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